Sellers additional photos shows style 8 barrel address, ramp front sight. According to Murrays style 8 used between ser. # 332,000-448,000, 1930-1946. Receiver much earlier. Anybody have an approx. year on receiver based on #?
Is there a Savage 99 stamp on the receiver ring? If so it is probably Savage assembly or rework. Other than that you will have to letter it to see produced/shipped.
I know there is a 99-H, 1870xx that lettered as 1932. Seen several other early receivers used at much later dates.
That low numbered action probably is not heat treaded for .300 use. If it had been rebarreled at the factory I think it would have had the Savage Model 99 stamp added to the receiver ring and heat treated. Just my $0.02.
Shooting Times Westerner IIRC. The links above should tell. Was a semi-popular wildcat back in the day and may or may have not been legitimized by some manufacturer or another. Can't remember just now.