Some more info on it. I think it is listed in Albert's Button Book under the heading of "Other Veteran Organizations" It is button VN20A, and it states - The SV monogram with 13 stars encircling; staff Fox patent back. It did not tell me if the back was brass or iron like yours is. Here is a picture of the fox patent back design.
Yours may not be this back design.
Finding relics is in my blood
GPX 5000, CTX 3030, E Trac, Vista Gold
LOVE THE FINDS! Silver Ring, Indian AND Cool Button, MY FAV'S!
Detectors & Equipment:
DFX, 950, Eclipse 5.3, DD Shooter 4x6, DD1400, Super 12, DX-1
Prism IV , 950, BigFoot Coil, 120& 140 PP
CZ-70 Pro, Lesche Digger and SS Water Scoop
Sweet looking "07" IH. The ring looks old and I'll bet silver. Have you been able to find out anything on the button??
V3i- Prism IV- Pro Pointer
2020 GOAL: Any Flowing Hair coin
TOTAL 100 YEAR OLD COINS - -280
2020:
Silver: 11
Oldest U.S. Copper - 1795 Liberty Cap
Oldest U.S. Silver - 1829 Capped Bust Dime extra large 10C
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Congrats on the variety of finds, when you have a hunt like that it keeps things interesting, you never know what might be in the hole. That ring looks great as well as the 1907 IH. Safe & HH