pic of my 1940 vintage 99RS showing the 2 point checkering, the sling and sling swivel. Serial #3888XX
next pic shows the buttstock, swivel and sling on the 1940 vintage RS. It has a Lyman 70LH peep sight (not shown).
For comparison a 1950 vintage R. It has the sling eyes like the RS so it have started life as an RS. Serial #5739XX. Note the simpler checkering.
The 1950 R has a Boone 2 1/4 power scope. I posted many years ago. Figured the new guys would like to see it.