Old Shotgun - Can you help ID ?

[hfp75]

This old shotgun has just resurfaced from a family estate - there are no current plans to sell it but I am interested in any information that I can get. I know it is a European shotgun and I think its old..... beyond that I am looking for information.....

Its a 12g and was shot on holidays into the late 1990s...

Here are Pics:
https://imgur.com/PPrpHYp
https://imgur.com/jXlmv0U
https://imgur.com/Be4CYNI
https://imgur.com/G92G1hD
https://imgur.com/XSfVNzq
https://imgur.com/hS9dOiM
https://imgur.com/G92G1hD
https://imgur.com/LTV3q6w
https://imgur.com/Zg7tFQJ
https://imgur.com/3cCSsaX
https://imgur.com/u3jmEGd
https://imgur.com/huaHSqe
https://imgur.com/ue4bTKE
https://imgur.com/snSl07x
https://imgur.com/dYz4lIZ

 

[Londonshooter]

Well, we will see if anyone corrects me on this but believe gun is from 1870's which would make it quite an early breech loading center-fire. The steel butt plate and single bite support that.
Appears to be a Schneider patent mechanism although the examples I have seen are back action rather than bar action. The barrel proofs are from Liege, Belgium, but isn't that a Birmingham proof mark on the action flat(?). The raised cheek piece and sling hardware are not in keeping with a British gun but rather a continental gun. Google search found some later Theate & Co. guns with very similar engraving. Spelling Phoenix incorrectly on rib not a good omen. If barrels are in v. good condition then would limit use to low pressure 2.5" shells only regardless of holiday tradition.