The markings are simple the WD arrow and the AM - Albion Motors logo and nothing else. To be honest, and not being a dealer or trader of any sort, it's just another 'Enfield' revolver sub contracted out. I don't think that the value is very much at all. Maybe just the same as an old Enfield. It's certainly been un UK service by being modified as it is....... or if not UK, it was certainly modified by us because so far as I'm aware, no-one else modified the grips. We did hundreds and hundreds for the local Armies and Police
On that basis, I'd just keep it and enjoy it. And consider yourselves lucky that you can own one. In England, we can't own anything like it