I don't know anything about Buffalo Nickle varieties, but is the mm location almost touching the E typical or unusual?
Go to varietyvista.com go to buffalo nickels ,rpm's < not omm's > 1938 D There are 9 RPM's for the 38D look at mm placement on all of them.... You'll see placements are all over. Remember to take die state into consideration too when trying to id. As there maybe a trail of clues all leading to the answer...and there maybe certain clues missing... yeah I believe what 3 ,6, and 9 the mm is located at the S E foot of the E
Ok here is what I expect in 1942 there were 2 proof nickels 1 pre war issue alloy and #2 the war years silver alloy. So if you notice your date 1942 look at the 2 the 2 is a dead give away for an 1942 wddo-001 ...... however that ddo was struck on a pre war alloy blank......your showing an 1942 silver war nickel that obv. Is the same as the 1942 ddo 001. Meaning yes the type 1 proof dies were indeed used to strike war proof coins and most probably ms strikes afterwards. Is the profile sort of doubled?
Picked almost all these up recently and immediately sent them off to be graded. Had some good results.
So I added this 1916 two feather Buffalo. Graded by Anacs I. Xf 40 ADO 2F #04 BO5-162F-Multi Dies FS#-05-1916P-401 Relatively common with an URS -12 What is interesting on this variety is the back of the neck. You can definitely see the Abraded missing feather and the file lines. Now the back of the neck is actually a clash and the buffalo cap fur.check it our. I do recommend the Abraded die Varieties by Ron Pope. I do believe this reference is no longer in print but can be found .
The mint mark is too low. The 1938-D/D RPM-003 has a fairly bold 'under-mark' to the west on the upright and inside the curve.