Just a little precisoin on 640's.
The early 640's S/N range includes some rifles made on M/46A/B stocks, but they are only barreled in 6.5X55.
The M/98 were not really availlble before 1946, probable hitting the market somewhere in '47.
HVA used the M/98 in the '37 to '41 period for their models 146 and 246), then, late / after '46, when they became availlable again.
After '41 until '45 (1945 for the 46A and officially 1943 for the M/46B), they supplied M/38 actions to the civilian and this, until the FN action becaeme availlable (M/46A, M/46B, M/46AN). The M/640 was availlable from 1944.