To help narrow the date down, based on my observation of the reverse clash mark, its either a 1922 or 1924. The only logical vams that possibly match yours are:
1922 VAM-2R2, 2R3, or VAM-2U1; or a 1924 VAM-1CO unless I missed something.
Im sorta a fanatic for trying to pin a date on historical items, just because it is possible and fun to do

Almost forgot, it would be a B2 reverse if it were a 1922, since there are three hills to the right of the eagles base.
Edited by mrwhatisit
01/19/2021 5:59 pm