I've managed to narrow it down to Birmingham, J.W.Tiptaft (1886), but the date letter says around 1850- so I'm a little confused by the conflicting dates? I'm a complete amateur at reading hallmarks, so if anyone can tell me anything more, that'd be great, thanks!
(Also, serious apologies for the large photos- I've tried to make them as small as possible for people with lower-resolution monitors, but large enough to still see the marks!)
The whole thing (front and back)
Hallmarks on the ring and medallion itself
Closeup of hallmarks with some playing about in Photoshop to make them more obvious. (My eyes aren't all that great!)
If you could tell me anything about this, thanks for your help!
