Newmac furnace serial no

Can any of you help me get the date of manufacture of a Newmac furnace? Serial no; NL2 021803 D 036000.
Thank you.

check out this link it is the most comprehensive that i have found

Thanks. That is a more complete list than the one I use but Newmac isn’t on it. The seller produced documentation regarding the age so it isn’t a big deal anymore. Strange though that it isn’t listed.