Murray,
The mag with the S 42 stamp is a WW2 armorer's replacement magazine made by Mauser... it is not correct for your GNR, but I am not sure what would be correct. I am just guessing  but I think it would be a non-blued (nickle?) tube with a wood bottom, and probably not numbered (plain)... Now let's wait for someone who has a complete rig to give us the real scoop on what kind of mag you should have to be correct for the period... 
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regards, -John S
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