How old is a Harrington Richardson Model 48 serial number 26769?
Since you do not say, whether your Harrington & Richardson
is a pistol, rifle or shotgun and you do not show a letter prefix
to the serial number, I can only give you limited information based
on a Model 48 Topper Single Shot Shotgun which was manufactured for
a period of 14 years between 1943 and 1956. I hope this helps,
until you can supply more information on your shotgun.