What gauges did Janssen shotguns come in?
Janssen was a major gunmaker in Belgium c. 1880-1915, so probably made shotguns of every size from little 9mm garden guns up to 6 or even 4 gauge market guns. Almost all of those made for import to the US would have been 12 gauge double barrels with a few 16’s, 20’s, and 28’s, but probably nothing smaller unless maybe a few single-shots in .44XL were ordered.
