Flat Plate Imperf Coil 384v (?) Cover With Interesting Rate

Thought some members would be interested in looking at this cover and puzzling the rate(s) paid.

We have a line strip of four and a paste-up strip of five 2¢ flat plate imperforate coil stamps (likely Sc. 384V, but possibly 344V) together with one 1¢ Sc. 410 (the 1912 perf 8.5 coil issue) and one 2¢ Sc. 634 (the 1926 rotary press perf 11 x 10½). The total postage paid amounts to 21¢ which appears (to me) to meet correctly the applicable rates.

I got it some time ago for the flat plate imperf coil usage as these coils interest me.




In the spirit of puzzling fun, would anyone care to explicate the rates involved?

I have to run at the moment, but in another post I'll give some background on Mr. Bauer.

So about Mr. Bauer...

We know Emery A. Bauer (1881-1971) was a stamp collector back one hundred years ago. He applied for reinstatement in the APS in November 1924 and he also joined the Czecho-Slovak Phil. Soc in early 1941.

His day job was as a school education specialist with the NY State Dept of Ed in Albany from 1919 to 1951.
Bauer was Colgate 1902, and in addition to being captain of the track team, he'd been the manager of the Colgate football team. So he was doubtless quite pleased at the outcome of this game for which he ordered tickets. On 17 November 1928 Colgate defeated Syracuse 30-6.

I speculate that he had a stock of the 1910 imperforate coils which he was gradually using and preserved the covers as they came back to him. I have another which he sent in 1929 to his mother-in-law in Ohio, which she must've saved for him.

15 cents registration (indemnity < $50), over 2 up to 3 oz at 2 cents per oz (3 x .02= .06). This provides the 21 cents a reason to exist.

The first class rate in November, 1928 was still two cents. The registration rate was fifteen cents. The return receipt cost three cents. Total of twenty cents, Not sure why the extra one cent stamp was affixed?