If anybody has been looking for something like this, there single-barrel 4 bore percussion gun for sale in UK on Gunstar:
https://www.gunstar.co.uk/e-m-reilly-co-fowling-piece-4-bore-gauge-muzzleloader/Shotguns/1352767

The gentleman selling it says it has no serial number and "E.M. Reilly & Co." on the hammers. There is not a lot of detail in the ad but he is responsive to messages.

I commented that with the name "E.M. Reilly & Co.," the percussion-gun would be post April 1859. With no SN it was probably made in Birmingham and Reilly engraved and retailed it. The price is £800. No certificate needed. I assume you could just put it in the mail, or in your luggage. I thing Richard, the seller, is looking to post some photos. I for one would like to see what kind of barrels are on it. 12 lbs plus....41" barrel.

Last edited by Argo44; 09/02/21 05:01 PM.

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