Bob, The markings on your tube, indicate one of Portugese manufacture. The "M" on the alum bottom appears to be cast in, rather than stamped, so it too may be Portugese made. This type of post WW2 mag, usually has a crude light colored wood bottom. The Mauser mags supplied with the GRN contract in 1935, will have the typical nickeled tubes of the period and usually unnumbered alum bottoms. TH
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