These guns are a bit different. I have had a few over the years. The action is interesting, as you say, not an Anson & Deeley as most would assume by looking at it.
Encountering guns like this is what started me on the idea of writing a book about boxlocks to address the variety of guns which all look the same externally but differ so much internally.
The '0' prefix on your Lancaster shows that it was made in Birmingham (most likely by Osborne) . These guns, in my experience are light and lively handling. The only minor gripe is that the gape could be a little more open.
Looks like you have done a nice restoration job on the old girl!
