MYSTERY on era? Print GMAC issued -- The First Carriage, The ARIEL aquatint

Need Help to understand the age of this reprint and if anyone knows how it's done. Watercolor? and GMAC's involvement in this print seems to be an issued limited edition to some of their purchase plan consumers. Found at an estate sale, this caught my eye with the antiquity in the aging and yellowing yet still looks new or untouched...
So I assume it's issued in the 50s?? and it appears to be on canvas paper.
I was able to find out that GMAC did have a Time purchase plan that they advertised often in magazines. That's about it and I would be delighted if anyone can assist with this mystery.

It does say Limited Edition.... and the condition is like Mint..