CM76,

Wow, what a nice looking Lancaster and in a caliber that I don't have. I like those early Lancaster hammers. I have a 360, 450/400, & 450 but no 500s. Unfortunately, your rifle isn't in the USA.

Probably the most important question is how does it shoot? Do you have a range report? If you get the combination (bullet size & powder charge) right, they are very accurate rifles.