the Haenel looks interesting, which model is it? Is it dated, maybe with a stamp on the heel of the stock?
The prewar Haenels were dated with two digit month/year under the cocking lever near the breech. Only the smaller Dianas (model 35 and below?) had dates on the heel of the butt.
Vintage Airguns Gallery
..Above link posted with permission from Gareth W-B In British slang an anorak is a person who has a very strong interest in niche subjects.