Truly amazing Michael!!! Your photographic treasury is priceless, and this piece looks like it really meant business....never thought of a one barrel, let alone four barrel. It has always interested me that the early pistols, being single shot of course, were designed to use as clubs when the charge was spent.....this would be dramatically the same concept.
Looks like a Landsknecht 'pepperbox'
Thank you, and welcome home!!!
All the best,