Sorry, BAD, Blue Book does not show a Heym .22.
EHP, we need pictures.
This might be one of many sporting, target, or military trainer .22s turned out in 1930s Germany.
Ol' Adolph and the boys were real shrewd about encouraging smallbore shooting, glider flying, public works civil engineering, and other such stuff as led right into military training for when they were ready to remilitarize.