Hi Padre, The zig-zag spring (the kind that fills the whole body of the magazine) was patented in 1938 and introduced in 1939. They were installed in what collectors call extruded magazines (although they weren't) with the squared off bottoms and aluminum or bakelite bases secured with a central pin. If you have one of these zig-zag springs in a wood based magazine, it is not original. Regards, Norm
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