Evening, Bruce.
My best guess would be a series of Signal Corps Inspection Stamps.
They are usually close to a ‘Chinese Red’ in colour (go figure these days), square framed with two or three alphanumeric characters inside. They also appear in differing sizes like the C-Broad Arrow.
I have seen them before inside US 19-Set HOLDERS, Watches, but usually only one or two. Looks like somebody did a Happy Dance on this one!
I wonder if the HOLDERS, Watch in US production were imports from Britain, or Canada, or locally produced?
David
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