Not quite Copperplate Gothic
Hmm … having looked at the serifs on the C G and S, I don’t think this is Copperplate Gothic after all. It is an all-caps face, a bit dinged up. Any ideas?

Not quite CP.jpg
ffi |
fl |
5m |
4m |
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k |
e |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
$ |
@ |
# |
Æ |
Œ |
æ |
œ |
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j |
b |
c |
d |
i |
s |
f |
g |
ff |
9 |
A |
B |
C |
D |
E |
F |
G |
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? |
fi |
0 |
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H |
I |
K |
L |
M |
N |
O |
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Hmm … having looked at the serifs on the C G and S, I don’t think this is Copperplate Gothic after all. It is an all-caps face, a bit dinged up. Any ideas?
Not quite CP.jpg
This looks like Tiffany Gothic (later called Plate Gothic according to McGrew)—a face offered by ATF very early in the 20th century. Some showings have a different G than yours, but my font has the same G as yours. Here is a specimen with your G in the 1902 ATF catalog.
https://archive.org/details/deskbookoftypesp01amer/page/n445/mode/2up
That it does! That’s exciting — thank you! I read up more here: http://luc.devroye.org/fonts-71683.html
This deepens a mystery I’m working on. My font comes from a shop (a garage, really) most likely active from 1928-1941. I was assuming that all the fonts were acquired from Kelsey along with the press, but perhaps this one is older? I don’t see it in the 1928-29 Kelsey catalog.