At that serial number, they had changed from stamping serial numbers on buttstock/buttplate/forearm to stamping an assembly code. If yours doesn't have an assembly code, that's definitely unusual. Usually 4 alphanumeric characters, and usually also stamped on the left side of the receiver under the buttstock (above the lever).
Not having an inspection/date stamp on the lever boss is very unusual - but not unheard of. We saw a 99R last year at a gun show in great condition like yours that didn't even have a serial number. All other assembly/proof marks, just no serial number. Never Say Never.
The end of the muzzle in 1950 I think should be blued. But not 100% sure on that.
Last edited by Calhoun; 10/29/18.
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