Hi Jens
Another excellent rifle!

Love the percussion style fences

The high hammers would lead towards 1870s+ but rebounding locks a little later

The .500 express at that time was more likely to be for India, Africa tending to be a little later or larger bores for dangerous game and the .450s for thin skinned game

I sold my only .500 double some time ago and only have a single shot in that calibre now

There are two on Gunstar but neither appeals especially now would have to be bought unseen but could be tempted! except for the cash spent on the .450 - 3 1/4" Lancaster q.v.

Good that you got it locally, range reports expected as soon as coronavirus allows!

Good luck shooting and thanks for showing

Tony