Montgomery Ward Signature Age

Can anyone tell me the age of this unit?
Montgomery Ward Signature Air-conditioner packaged unit with Gas heat
Model SRM-51824A
Serial A09DN1X F5227 1606


Montgomery** Ward **
Serial Number format: KP30102F52756585
(This serial number was transcribed from an actual furnace during a home inspection).

Using the four digits located after the last letter in the serial number (usually an “F” or “M” located in the center or 8th digit of the serial number) KP30102F52756585 you will find the week and year of manufacture. The first two digits are the week of manufacture and the last two digits are the year. This unit was manufactured in the 52nd week of 1975.

Week of manufacture: KP30102F52756585
Year of manufacture: KP30102F52756585****

That serial number sequence won’t work, it will put the unit at 1927. The house was built in 1953. The original heater was a floor heater. I’m guessing this unit is 20 to 40 years old. Any other guesses for older units?

That particular model was manufactured in 1970 through 1971.

Don -

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