Michael George Stroka (May 9, 1938 in Passaic, New Jersey – April 14, 1997) was an American actor on soap operas like ABC-TV's "Dark Shadows", in which he played Aristede, Bruno Hess, and Laszlo Ferrari from 1969 to 1970. In addition, he made a cameo appearance as a pallbearer in the MGM film, "House of Dark Shadows", the first of two feature films based on the ABC soap opera.
House of Dark Shadows was released in 1971.

It's never explicitly mentioned when it was released, so we don't know. It's difficult because the years 1969 and 1970 are mentioned which are close to the year in question.