Over fifty years back, I saw a Belgian double .22LR at Judson Darrow's shop in Connecticut. My recollection is faint and I was much less knowledgeable then than I am now, but I think it was a Francotte and a boxlock. Frame bulkier than Bailey's, though. Wonder where it is now.

Also in Darrow's place that time, the well known Fugger engraved G&H HiWall with the gold miner menaced by bears. Darrow was working on a Pope scheutzen for author Lucian Cary. For me, he removed a Niedner mount from a Pope magnum Mauser .300 Hoffman and fitted a G&H base in the same holes.