This may turn out to be an adventure afterall!
I made contact with the Senior Director of Photography at the Swann Gallery in NYC, and after many email exchanges and photos sent she asked if I could come in to see her so she could further evaluate the piece!
Said "Should we be able to offer the piece at auction there would certainly be a sale for it"
What it comes down to, is whether it is a "photogravure" or a "silver gelatin" print.
[fingers, toes, eyes, legs and NOSEhairs crossed that it be a silver gelatin!]
...now...how to get to the city for a whole day...