Your magazine is the "spare" magazine (as indicated by the "+" mark) for a WWI Erfurt Luger. It appears to be in nice condition, although in the one photo it looks like there may be a chip out of the top of one of the "knobs". The chip is repairable if one wanted to do so, and even without the repair the magazine has value.
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If it's made after 1918...it's a reproduction
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