These Mauser marked swing mounts are from the 1989 - 1995 period, when Mauser stamped their logo on nearly anything bought in to make a profit. AFAIK these mounts were made for Mauser in then Yugoslawia. They were offered as a "factory option" with the Zastava made "Model 98", see Jon Speed: Original Oberndorf Sporting Rifles, page 401.