I have received the 2 Canon extension tubes EF12II & EF25II. The only writing on the tubes was "1301" on the EF25II and "1201" on the EF12II. So my question are these S/N?
On the box there are several more writings, for the EF25II:
CZ 23522000DB0107
9199A001 [AA]
EAN/JAN 4 960999 204307
UPC 0 13803 03560 5
Searching the web EAN is probably Electronic Article Number, JAN is Japanese Article Number and UPC is Uniform Part Code.
no "1301" in any of the above.
On the box there are several more writings, for the EF25II:
CZ 23522000DB0107
9199A001 [AA]
EAN/JAN 4 960999 204307
UPC 0 13803 03560 5
Searching the web EAN is probably Electronic Article Number, JAN is Japanese Article Number and UPC is Uniform Part Code.
no "1301" in any of the above.