It is certainly a BSA, they were all made with an action body shape similar to the Facile Princeps but were of course A&D actions.
![[Linked Image from i.imgur.com]](https://i.imgur.com/e9UUhZz.jpg)
Note the action shape and screw and pins placement on the BSA BLE “specially made for Fletchers of Gloucester”.
![[Linked Image from i.imgur.com]](https://i.imgur.com/zEevTjQ.jpg)
And the shape of the bottom plate (loads of room for engraving).
![[Linked Image from i.imgur.com]](https://i.imgur.com/89ZGH0O.jpg)
Dovetailed chopper lumps.
Sooo … inside my £150 (if I am lucky) BSA lurks a $6,995 best boxlock just waiting to be liberated by a good action filer, engraver and stocker (the existing walnut, straight grained with a “fiddle back” ain’t bad).
I believe BSA directors and senior employees may have used De Luxe models.
I wonder if one of them made this anonymous example as a “show and tell” gun - “Who do you think made this?”