Your postal card is either UX27 or UX27a. UX27 is on buff paper and UX27a is on cream paper. The problem your postal card is heavily oxidized. So its hard to tell the difference, but I'd guess it's UX27.
The top postal card is UX27 and the bottom one is UX27C.
Not private printing, but likely private cutting. This card was available in sheets - sold mostly that way to printers, who found it more efficient to print business messages in sheets then cut the cards to the correct size for mailing. The perfectly rounded corners look like cutting by a printshop. Is there any printing on the reverse side?
UX27 was printed on a wide variety of papers including off-white, cream, yellow, canary, and a large number of shades of buff. The USPS catalog lists S37Ea printed from horizontal curved steel plates on dark buff paper between 1928-1930. The rounded corners occurred after the cards reached the public. Valued at $ 5.00 in mint, very fine condition in the 2015 edition of the catalog.
Pure speculation on my part, not being a postal card collector, but could this be a counting card from the process of banding 250 cards for that mode of sale?
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