It would be so simple to look at the serialization book (never crossed my mind until now). Just a quick glance:
171294 16 ga 26" late 1915
171357 12 ga 26" late 1915
172051 20 ga 26" late 1915
Everything before that conforms to their standard offerings (a quick glance revealed none but I can't guarantee I did not miss one). So in late 1915 after three plus years and a very large run of standard offerings that did not vary from their steadfast rules these "short barreled" guns start showing up in small runs at first and then larger ones to the point where the short barreled 16s and 20s were as numerous as their 28" predecessors. But not so for the 12s. Twenty-six inch 12 gauge guns are out of the ordinary during the early Parker Trojan years from what I see.
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