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I think that is a logical stance, I would assume that those that were un-stamped between 1890-1891 were simply sold as non-export..

I did quite a bit of reading on this and I found a really good...

It is not so exact

McKinley Tariff - Wikipedia, the free encyclopedia


Start there and continue the search for even more info on dating antiques..

The stamps are simply a clue to the dates...