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Those aren't rare at all, there were thousands of them made by Savage for the Canadian and British armies (along with other Commonwealth nations) during WWII as part of Lend-Lease.
My father has mine in his gun cabinet back home, it's a sportered '42, all matching, and with the bayonet lugs still on the barrel. IIRC he paid 24.95 for it, and that included the bayonet, a soft case, and a box of Imperial hunting ammo (of course, this was back in the late 60's )
They're not as rare as Long Branch no-star's but a matching all-original one would be relatively rare. I have a tired old example with bolt mismatch that has one of Savage's 6 groove barrels and it still shoots pretty good.
Not a lot of them made befor changing to mk1*. Have never been able to find anything but a guess. I have a Savage Mk1 receiver but that is all.
I also have a Long Branch Mk1 receiver but somebody ground off part of the #s