Lyman Model 57SME mounted on M96 CG Swedish Mauser Question

I recently purchase a M96 Swedish Mauser in 6.5x55 Dated 1918
I was curious how early did Lyman start making the receiver sights Lyman Model 57SME
which was mounted on the rifle already. I have been looking around and Brownells still sells this type of sight. Even though the sight is not original equipment I like it for shooting with my old eyes. It looks better than a scope I think. Just wondering how long this sight may have been on the rifle.

The Lyman 57 series was first produced in 1938. ref. Nick Stroebel, "OLD GUNSIGHTS " a collectors guide, 1850-1965

Thank you Muffet.2008 for the info on Lyman Model 57.