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This is a single shot but obviously high grade when made and one I haven't seen before. I don't believe the chambering description but don't know what it might be. Any comments?

https://www.gunbroker.com/item/991200516

The rolling block shotguns made in Ilion by E. Remington & Sons were made on both military rifle frames (top tang as long as the lower tang) and sporting rifle frames (shorter top tang). They were chambered for paper 20-gauge shells or the 16B brass shells.

I spotted an Belgian proof mark on the gun on gunbroker --



Most of the fancy rolling block shotguns were made by the various licensed foreign rolling-block manufacturers. I have only ever seen one fancy one that was pure Ilion.

Husqvarna offered them for decades in a number of gauges. Here from a 1927 catalog showing 12- to 28-gauge offerings --



In the November 1949 catalog they still offered 12- and 16-gauge --

Francotte made some Rolling Block rifles under contract from Remington