Wow, I have collected 3 of these in the US all within one year after I retired. I had a German citizen contact me wanting to buy one, saying they were very rare over there. I have seen several ads printed in the US from the 1930’s-40’s for the 28-R. Both implied that it was the only model 28, that the company imported, though one imported a whole line of Haenel rifles and pistols, see below. Collecting is funny, after collecting 3 in one year I have not seen any others, since? And it took me a while to find a Standard 28?
Another ad in a Shorting Goods Catalog, showing only the Haenel 26 and the 28 repeater though the pic is the 28?
These Haenel’s got me hooked of blued milled airpistols. What followed was a further collecting of Webleys.