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Thank you for the better photos, and especially for the precise size-measurements.
Your find is the correct size, shape, and contruction to be what we civil war relic-hunters call a "clipped corner" Militia plate. Specifically, because yours has just two solder-spots, oriented horizontally on the plate's back, it would most probably be a shoulder-belt/breastplate. The two solder-spots anchored either a long pin-clasp or two loops. This type dates from the Colonial era through the civil war era. It was used by various Militias, rather than being limited to just one particular state or city. Some had an engraved emblem/letters/numbers, others had an "applied" emblem, and others were blank.
Examples of the basic style of your "clipped corner" Militia shoulder-belt plate are shown in the book "American Military Belt Plates." In it, see:
plate #51, Massachusetts Militia (page 43)
plate #60, New York Militia (page 49)
plate #731, Boston Light Artillery (page 438)
plate #732, Rhode Island Militia (page 438)
plate 439, New York Light Guard (page 439).
Breezie, what are the dementions of your plate and what do you think its made from? I don't know anything about it or CW plates at all, but you stated that the holes look to be field made and I'm interested in how a soldier could make these holes in his camp without many tools. Thanks.
As the mytreasurespot.com photos show, at least a few sheetbrass beltplates were converted for other use after their soldered-on attachment hooks broke off.
Breezie, about your plate:
You say it measure 3-inches by 4-inches. That size is significantly larger than the military belt-plates (which typically measure 2-to-2.25-inches high, and 3-to3.25-inches long). If your 3"-x-4" sheetbrass plate was manufactured for use on a belt, that would indicate it was a heckuva wide belt. Not impossible, of course, but it seems not very likely.
I wish your plate wasn't so heavily corroded & concreted, which causes uncertainty about whether it actually does have solder-spots or not.
The holes in your plate seem to be at least 1/4-inch wide, which strikes me as oddly large. If it was to be attached with small nails, or rivets, the holes wouldn't need to be that big ...unless it was going to be used in "very rough service" situations.
Sorry to be unable to be more helpful, but the above is all I caan think of for now.