Sears Furnace age

Hi All,
I’m looking for an age on a Sears furnace
M/N: 867.762331
S/N: H61846142

From other posts I’ve found, it looks like it could be an 84 or an 86?

Thanks for any help! :slight_smile: Mark

Mark, according to my copy of the Carier Blue Book that model # was manufactured between 1986 and 1988, it is rated at 105K BTU’s Afue rating of 78.7

Thanks for the help Joseph, much appreciated!

I get August 1986.