Lol not my gun/picture but I do enjoy enfields! Alot of the no5s were made domestically here after the war out of surplus no4s so I've learned to be careful what to look for. I'd love to find an original no5 though. I've got a lend lease savage, a 1918 enfield and and ishapore 2a.
You should definitely do a little research, you might have a rare or uncommon variation. Most of the savage made (lend lease) guns had US Property stamped along the top of the receiver and this makes them pretty easy to identify. Also they had the simple two aperture flip sight similar to the ones on the m16 a1/a2. The British and Canadian guns should have markings on the receiver where the rear stock mounts up, usually a crown over a GR for the British made guns and Long Branch for the Canadian made ones.
Not a super expert but these look like light dragoon pattern pistols, often called the "Elliot" pattern pistols which were issued to British mounted forces starting about 1759. These pistols would have likely been carried in a pair by a mounted British officer in conjunction with a saber. Interestingly these are mounted in Iron and not brass as was usually seen on the light dragoon models, as well as having an early sliding dog style safety behind the hammer. Its possible these pistols were special made for whatever officer carried them. Most common caliber for dragoon pistols is .62 to .69 smoothbore.
This is interesting, the markings look like savage but I'm not seeing a US property stamp on the top of the receiver. It looks like it might have been refinished at one point because the 1942 date has been scrubbed out a little bit. I was looking at long branch proof marks and none of the proof marks on your guns barrel fit. Also the English proof marks are very noticeable and your gun does not have them. If I had to guess it may be a very early savage made lend lease gun.