Hi all. I am new here, please forgive any formatting or etiquette anomalies.I just bought a 16 gauge over .410 Franz Kettner Shotgun. A bit of an oddity, but it is a pretty little thing. I can't really make any sense of the proof marks, however. It seems to be proofed for several types of bullets. Was this gun intended for some types of slugs back in the day? (I think the day was 1926--there is a "3/26" stamped on one barrel).
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