I've got a few (understatement). Here's my current fav. It's a 475 3 1/4" NE. It's a London Cogswell and Harrison built in 1919-1920. Sold to a G.D. Lyell esq. in July 1920 for £ 52. 10s.
Still has original proof marks, but was gone though a while back. Re-blacked barrels and bone charcoal case hardening.