No LSD but some nice Lager. LOL
But your pleasing comment made me check some other sources and it seems that HW77 was established earlier than 1980 indeed. All I could find so far sounds like early 197*.
So please accept my sincere and humble appologies.
I checked
http://www.weihrauch-database.eu/thelist
and the earliest entry of a HW77 (in .22) / ser. no. 683223 there is dated 1973 (estimated by computer).
So still not sure WHEN EXACTLY they came to the market.
Do YOU know more?