Original heater core?

Got the heater core out of my 69 Super Bee to have it pressure tested. It looks great. I don't see any stampings or marking by ANY manufacturer, Chrysler marking or part numbers. Any of you experts have knowledge of these? I'm really just curious if this is the original heater core. I would have guessed it would have some kind of marking. Lynch road car if it matters. Thanks!

I'm WAG ing but I would think Ma would have put some marking on it if it was OE. here's a BTT for ya

Ive got a 73 Dodge Dart Sport OE heater core and it has No markings or numbers on it Either. Im sure yours is a original OE. If they didnt mark them in 73, I bet they didnt mark them in 69 either.