Age of a Singer a/c

Can anyone help me date this appliance:
Brand: Singer
Type: Air Conditioner
Model: ACR 50029-1A F
[FONT=Verdana][size=2]Serial: [/size][/FONT][FONT=Verdana][size=2]A0114000-C22-0974
[/size][/FONT]
Would I be correct in guessing September of 1974?

Thanks,

Earliest date for that model number in Prestons is 1975.