ancillary chat...
blcjr:
I believe you are correct, it is just all about the aesthetics. Your cover has a two color, thermographed, w/photo cachet by Walter G. "Bones" Crosby. In my humble opinion, an extremely nice item.
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Roughly, during this same time period, Edwin P. Haworth of Kansas City, produced the Pent Arts brand of cachets. He utilized the yellow-green dots border extensively for his special delivery FDC's. While they seem to be more common on #10 envelopes, I have posted an image on #6, just in case of any interest.
Respectfully submitted:
jrc531
