HW/Weihrauch HW - Marksman Model 40 Air Rifle. Closest HW match is . . . ?

[vintageairguncollector@gm]

Recently bought a Marksman Model 40 because it was made by Weihrauch. It would be great, if someone could tell me which HW model is a match for the Marksman model 40. The model 40 has a 18.4 inch barrel, weighs 7 lb, 5 oz its .177. The rifle has the diabol pellets pictured on the left hand side between barrel and compression tube just like my HW30.
Rifle is pictured below if that helps. Thank you.

 

[Silver Ace]

Kind of hard to tell from this picture. Looks like possibly HW50 or HW30.

Would need a clearer picture of the end cap.

 

[Chuck-in-Ohio]

The add on scope rail makes me think HW85/R10.

 

[Pellets&Pistons-(Razor62)]

Hard to tell for sure but I think It's gotta' be an early one. I'm not seeing a Rekord trigger. If I'm not mistaken, that's a "Perfeckt" trigger. I think that places it prior to 1955 as a date of manufacture. I'm no expert, however.