Check out Cornell Publications. 'H' prefix indicates 1948production year
Serial numbers were not required until 1968
1987
"P" prefix indicates 1953
"AY" serial prefix = 1982.
Harrington and Richardson made it.
M prefix to serial # = 1952 manufacture. Jim
Immediately after 119437.
50-250 usd
No way to answer without the serial number.
"M" prefix indicates 1952
'AZ' prefix indicates 1983
'AY' prefix indicates 1982