I have the 2 chips shown below. They are in great shape. They appear to be stamped and they seem to have some kind of coating over them. One appears dirty in the scan but I think it is from what the chip was coated with.
So far 5 chips have been found with different dates, they are in the other scan. They were found in an Antique Shop and no information was available. Have you ever seen them before? Do you know if there are others with different dates? Any info would be helpful. Sorry there aren't any for sale or trade at this time. I don't think there are any spares other than these 7 chips.
Thanks for looking...............Rog