Welcome to the forum. That gun was probably manufactured in the mid-1980s. The standardized modern seven-digit alphanumeric serial numbers (three letters/four numerals) first appeared in 1981, I believe.
Other than that, the M36 is a classic small-frame S&W. It was first introduced in 1950 as the Chiefs Special.
Shoot it safely and in good health.
(A moderator will probably move this thread to a different section of the forum to observe the chronology involved.)