I don't know where you got your info on production numbers, but methinks they are wrong! WHY do I say this? Simple, each production run on ser nrs was 10,000 and your rifle is a c suffix = 39201st rifle made marked SVW in 1945. By the way the original SVW codes were dated 45. The MB date code did not come into being until very early 45.
SVW coded rifles are not "exceeding rare", but are very uncommon.
Sarge