The small number visible through the toggle hole is 0,05 indicating it is a replacement pin .05mm oversize to compensate for wear. This probably explains why the retaining pin is missing, it was either too loose and came out or was never re-installed when the axle pin was replaced. Although the new oversize axle pin is probably nice and tight, a new retaining pin should be installed as recommended. Pretty nice looking gun.
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If it's made after 1918...it's a reproduction
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