On Foxx, the best way to tell which printing the card is from is to check the card back. There should not be a plain back or a "correspondence" back Foxx card, as those appear to be 1925-1926-27 [at latest] series. I would expect Foxx always to have a "not to be used" PC back. If there one of the other backs, it would be an earlier issue. If the Foxx predates 1928 I would also expect not to see "Made in USA" and not to see a uniform sans serif small typeface on the card backs. Beyond that, unfortunately, I cannot see how to pin down the Foxx date any more closely. A "Made in USA" back with the cruddy looking mixed typeface could be any time from 1927 on. A coupon back could be as early as 1927 if it is a stamped coupon. If printed, it would be a 1928 or later. Rare either way in the PC back issue.
Hope that wasn't too cryptic or confusing but it is late in the day thursday and I am tired.
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