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hankronWithout an overprinted date on the tax stamp (which is rare), Sweet Caporal is one of the most difficult unopened brands to date to 1909-11-- and any eBay seller who dates one exclusively to a specific period is jumping to conclusions ... Without an overprint, some relevant unopened brands that can be dated to a narrow time period include American Beauty, Coupon, Helmar and Piedmont ... The problem for the collector is that Sweet Caporal is by far the most plentiful brand on the market.
Also, the collector should not automatically assume that the correct pack will hold a Mint card. One might buy the correct pack for $900 and pull a $40 T206 out of it.