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What year are they?

Where have those ones come from?

It means it was made for Cabot stock, if the government wants a small quantity of watches they will come from Cabot stock rather than having some made specially.

The C means it was part of a run made for Cabot stock. Sometimes you might get one from Silvermans that was part of a contract order over-run. Sometimes you might get one without any serial number...

Have you tried contacting Silvermans?