Reebo....welcome, the "90" on small parts is simply the last 2 digets of the SN#, all matching is a real good thing, be assured it is a FXO mag, no such thing as a TXO, and would like to know what is on the bottom of the mag, proof/inspector marks, also Ed I do not see the grip marking strap mark you said you see, for right now I believe this is a Weimar police model, lets see this grip marking befpre I put money on it
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