Hi Alistair
There was another gun produced inbetween the BSF55 and the HW85.
The "New Model BSF55" being half HW85 and half BSF55 --- check out the part numbers.
https://www.gunspares.co.uk/products...-55-NEW-MODEL/
This gun was sold in the States as the Marksman Model 70
http://anotherairgunblog.blogspot.co...&by-date=false
So in effect the HW85 is the second Weihrauch reincarnation of the BSF55.
All the best Mick