Mechanical teardown
Top metal
Die labels
More or less a random sample. 1+ were selected because they had dead batteries from the eBay lot which could influence them towards being slightly older
0
AZ original
SMSC 1C 1C
1C5737 18A
-1P39
1
SMSC 1C 1C
1C5737 18A
-1P39
2
Marking
SMSC 2C 2C
2C5737 18A
-1P89
Non-optical mask ROM like on gray
3
SMSC 1C 1C
1C5737 18A
-1P39
4
SMSC 2C 2C
2C5737 18A
-1P89
5
SMSC 1C 1C
1C5737 18A
-1P95
SRAM
2 cells (top metal):
2 cells (top metal, crossed polarizers):
Serials
Black internal encasing
Serials:
20831403, 12/31/07 A4 120
21796856, 03/31/08 A5 120
21824463, 03/31/08 A5 120
21824389, 03/31/08 A5 120
21876215, 04/30/08 A7 120
21876327, 04/30/08 A7 120
21942156, 04/30/08 A7 120
21942158, 04/30/08 A7 120
21976165, 04/30/08 A7 120
21976278, 04/30/08 A7 120
21978178, 04/30/08 A7 120
21976311, 04/30/09 A7 120
21976276, 0430/08 A7 120
23871272, 08/31/09 A7 120
23871370, 08/31/08 A7 120
25775991, 05/31/08 A8 120
25776084, 05/31/08 A8 120
25776121, 05/31/08 A8 120
26887178, 04/30/09 B0 120
26887187, 04/30/09 B0 120
26887114, 04/30/09 B0 120
26887209, 04/30/09 B0 120
27314224, 10/31/10 B0 120
28162830, 12/31/04
28195108, 12/31/04
28307459, 09/30/05
38620077, 11/30/04
Clear internal incasing
Serials:
32336038, 12/31/09 80 120
43263383, 11/30/10 84 123