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ARIZONA ASSAY OFFICE


ALL
 ENGELHARD
 
is pleased to welcome visitors to our Arizona Assay Office Definitive Page. While our focus is clearly Engelhard, we recognize that many Engelhard bullion collectors also collect other bars and ingots. As such, we appreciate the opportunity to present additional collections and look forward to your thoughts and input!

Arizona Assay Office ingots were reportedly produced for Paul Franklin by Jack Stone in 1969 out of his North First Street location in Phoenix, Arizona.  These examples were produced in total mintage of 80 and in varying fineness of .720, .900, .925, .963, .999 and .9995 purity.  The .725 and .925 examples are similar to each other in casting size, but are distinctly different than the other examples.  Additionally, the .995 and .999/.9995 examples were produced using two different casting moulds, with ingots S454 and S456 being of a larger and more shallow casting mould than the other examples.  A few unique copper examples were also produced, and are presented within this page among their silver counterparts.

There are currently fewer than 50 known Arizona Assay Office examples, at least 12 of which demonstrate a single border ring hallmark stamp.


EXAMPLEOBVERSEREVERSECOMMENTARYKNOWN
WEIGHT
CLASS
KNOWN
SERIAL
NUMBERS
ESTIMATED
MINTAGE
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[Double Circular Arizona Assay Office Hallmark] [ ARIZONA ★ ASSAY OFFICE] [Outline of Arizona] [REG No. 5479] [925 FINE]
[Weight Class] [OZS.]
Pressed Finish1oz class bar produced by Arizona Assay Office.  This are a very thin and sheet-like bar..86oz
76  [.925 FINE]
<5
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[Double Circular Arizona Assay Office Hallmark] [ ARIZONA ★ ASSAY OFFICE] [Outline of Arizona] [REG No. 5479] [999 FINE]
Cast Finish1oz class ingot produced by Arizona Assay Office.1.87oz
1.90oz
B101  [.999 FINE]
B104  [.999 FINE]
<5
Screenshot_20190216-120803unnamed-7
[Double Circular Arizona Assay Office Hallmark] [ ARIZONA ★ ASSAY OFFICE] [Outline of Arizona] [REG No. 5479] [.999 FINE] [Weight Class] [OZS.] [Serial Number]
Cast Finish1oz class ingot produced by Arizona Assay Office in .999 purity.  Ingots B101 and B104 have the weight and purity stamps on the reverse of the ingot, photos forthcoming.1.71oz
356  [.999 FINE]
<5
DOUBLE RING HALLMARK
[Double Circular Arizona Assay Office Hallmark] [ ARIZONA ★ ASSAY OFFICE] [Outline of Arizona] [REG No. 5479] [999] [FINE] [Weight Class] [OZS] [Serial Number]
Cast FinishApproximate 3oz class ingot produced by Arizona Assay Office with occasional serial number ‘B’ or ‘S’ prefix and ‘S’ suffix on the purity stamp.  Note the varying purity noted in the serial number examples column.3.13oz
3.29oz
3.37oz
3.42oz
3.42oz
3.52oz
3.58oz
3.61oz
3.67oz
3.69oz
3.76oz
3.79oz
3.83oz
3.86oz
3.87oz
3.89oz
1101  [.999]
1099  [.999]
1058  [.999]
1074  [.995]
1190  [.999S]
1221  [.999S]
1027  [.999]
1066  [.999]
S454  [.999]
B1427  [.900]
S456  [.999]
1220  [.999S]
1059  [.999]
1072  [.999]
1075  [.9995]
1068  [.999]
<20
unnamed-1
[Double Circular Arizona Assay Office Hallmark] [ ARIZONA ★ ASSAY OFFICE] [Outline of Arizona] [REG No. 5479] [999] [C] [FINE] [Weight Class] [OZS.] [Serial Number]
[Letter ‘C’ repeated seven times]Approximate 3oz class copper ingot produced by Arizona Assay Office.  Note the ‘C’ designation on the obverse and reverse, denoting the copper composition.  Likely a prototype example, the casting mould measures wider from left to right and is shallower than its silver ingot counterparts.2.67oz103  [.999]<5
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[Weight Class] [OZS] [s925] [FINE] [Serial Number] [Double Circular Arizona Assay Office Hallmark] [ ARIZONA ★ ASSAY OFFICE] [Outline of Arizona] [REG No. 5479]
Cast FinishApproximate 3oz class ingot produced by Arizona Assay Office in exceedingly rare portrait variation and .925 purity.3.75oz104  [.925]<5
20190207_21055820190207_210616unnamedunnamed-120190209_211833Screenshot_20190207-202745
[Double or Single Circular Arizona Assay Office Hallmark] [ ARIZONA ★ ASSAY OFFICE] [Outline of Arizona] [REG No. 5479] [999] [FINE] [Weight Class] [OZS] [Serial Number]
Cast FinishApproximate 5oz class ingot produced by Arizona Assay Office with occasional serial number ‘M’ prefix or serial number ‘B’ suffix.  Some examples also include an ‘S’ prefix or suffix on the purity stamp.  Observed in either single or double circular Arizona Assay Office hallmark and in varying purity.
4.20oz
4.35oz
4.68oz

4.72oz
4.74oz
4.73oz
4.79oz

4.89oz
4.92oz
5.11oz
5.34oz
6.14oz
6.94oz
1076  [.9995]
1082  [.9995]
1150B  [.925]
1163  [.925]
1087  [.9995]
1081  [.9995]
1109  [.999]
1179  [S.999]
1005  [.999]
M21  [.720]
M22  [.720]
1011  [.925]
1180  [.999S]
<20
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[Single Circular Arizona Assay Office Hallmark] [ ARIZONA ★ ASSAY OFFICE] [Outline of Arizona] [REG No. 5479] [900] [FINE] [Weight Class] [OZS] [Serial Number]
[Weight Class] [FINE]Approximate 5oz class ingot produced by Arizona Assay Office with serial number ‘S’ prefix and 5.12oz weight stamp on the reverse for actual fine silver content.5.12ozS1427 [900]1
Screenshot_20190209-213540Screenshot_20190209-213552
[Single Circular Arizona Assay Office Hallmark] [★ ARIZONA ★ ASSAY OFFICE] [Outline of Arizona] [REG No. 5479] [999S] [FINE] [Weight Class] [OZS] [Serial Number]
[Double Circular Arizona Assay Office Hallmark] [★ ARIZONA ★ ASSAY OFFICE] [Outline of Arizona] [REG No. 5479]Approximate 5oz class ingot produced by Arizona Assay Office.  Note the single circular outline on the obverse Arizona Assay Office Hallmark and the double circular outline on the reverse.6.38oz1206  [.999S]1
Screenshot_20190207-202813Screenshot_20190207-202826[Double Circular Arizona Assay Office Hallmark] [★ ARIZONA ★ ASSAY OFFICE] [Outline of Arizona] [REG No. 5479] [999] [FINE] [Weight Class] [OZS] [Serial Number] [Custom Flower Stamp][★ A.M.CO. ★] [★ 999 ★]5oz class ingot produced by Arizona Assay Office.  Similar to our example above, but includes A.M.CO. counterstamp on the reverse.  This is the only known even 5oz ingot in this weight class and we believe at this time that the A.M.CO. reverse counterstamp was applied at the time of production.5.00oz499  [.999]1
Screen Shot 2019-02-15 at 9.38.17 PM[SILV.] [Single Circular Arizona Assay Office Hallmark] [★ ARIZONA ★ ASSAY OFFICE] [Outline of Arizona] [REG No. 5479] [999] [FINE]Cast FinishApproximate 5oz class ingot produced by Arizona Assay Office in exceedingly rare portrait variation.4.76ozSerial
Absent
1
Screen Shot 2019-02-15 at 6.06.16 PM[999] [FINE] [Double Circular Arizona Assay Office Hallmark] [ ARIZONA ★ ASSAY OFFICE] [Outline of Arizona] [REG No. 5479] [PD] [60]Cast FinishApproximate 5oz class copper/silver alloy ingot produced by Arizona Assay Office.  This unique ingot assay tested at 50% pure copper and 50% fine silver5.04ozPD 601
20190207_210657 20190207_212400SINGLE RING HALLMARK[Single Circular Arizona Assay Office Hallmark] [★ ARIZONA ★ ASSAY OFFICE] [Outline of Arizona] [REG No. 5479] [999] [FINE] [Weight Class] [OZS] [Serial Number]Cast FinishApproximate 10oz class ingot produced by Arizona Assay Office.  Note the single circular outline on the Arizona Assay Office Hallmark.9.21oz
10.43oz
S518  [.999]
S516  [.999]
<5
Screen Shot 2019-02-18 at 12.44.41 PM[Single Circular Arizona Assay Office Hallmark] [★ ARIZONA ★ ASSAY OFFICE] [Outline of Arizona] [REG No. 5479] [S963] [FINE] [G] [Weight Class] [OZS] Cast FinishApproximate 10oz class ingot produced by Arizona Assay Office.  Note the single circular outline on the Arizona Assay Office Hallmark and the ‘G’ prefix on weight class stamp.  This ingot does not include a serial number.11..57ozSerial
Absent
[.963]
1
Screen Shot 2019-02-15 at 6.31.34 PMScreenshot_20190204-235559[Single Circular Arizona Assay Office Hallmark] [★ ARIZONA ★ ASSAY OFFICE] [Outline of Arizona] [REG No. 5479] [925] [FINE] [Weight Class] [OZS.] [Serial Number][Weight Class] [FINE] [OZS.]Approximate 15oz class ingot produced by Arizona Assay Office.  Note the single circular outline on the Arizona Assay Office Hallmark and 14.52oz weight stamp on the reverse for actual fine silver content.14.52ozS1176  [.925]<5
Screenshot_20190207-212528 Screenshot_20190207-212540[Single Circular Arizona Assay Office Hallmark] [★ ARIZONA ★ ASSAY OFFICE] [Outline of Arizona] [REG No. 5479] [Serial Number] [999+] [FINE] [OZS.] [Weight Class] Cast Finish20oz class ingot produced by Arizona Assay Office, largest known weight class from this refiner.  Note the single circular outline on the Arizona Assay Office Hallmark.  This ingot is the largest known weight class and is the only Arizona Assay Office piece known to include a ‘+’ after the purity stamp and demonstrate a leading zero serial number.  There is a C. Rhyne hallmark over-stamped on Arizona Assay Office hallmark, pictured below.  This ingot is understood to have at one time been a part of the Craig Rhyne & associates precious metals holdings.
Screenshot_20190207-212528
20.00oz0385  [.999+]<5