There is a functional loading gate on the right side, but it's marginally useful as it's difficult to cap the nipples even with it open (impossible if it's closed).
The date of manufacture comes from the date stamp BL. I've never seen this particular gun in a Uberti catalog of any type, and yet there are several in use in the UK.
Unfortunately, it is not particularly fun to shoot. First there is the loading problem - it must be done with the cylinder removed and installed in a loading stand. The one they're providing is difficult to use - notice that the fulcrum position and the stud for mounting the cylinder are not adjustable, so there is no ability to adjust the alignment of the ram; if it's wrong, it's wrong. I bought one for $65 from Powder, Inc. that's much better as both those items are adjustable. I load 3 cylinders at a time and just switch until I run out, then sit out until I can get to a place where I can reload the cyinders. And because it's hard to install caps with the cylinder installed I often cap the nipples with the cylinder out of the gun - not a good idea.
Second is the problem of spent caps; there's no clearance at the back of the cylinder to shed spent caps or fragments. What happens is they fall down behind the cylinder and jam the action. Sometimes every shot.
Sure is a pretty gun, however, and shoots very nicely when the caps are not an issue.