Bureau of Engraving and Printing says that series was used in Iceland, Cyprus, Japan, Philippines, and S. Korea.. it looks like the portrait of a Senator's wife, so my guess is it's a portrait of Dorothy Walker Bush when she was younger.. her husband Prescott (the banker) was on the Senate Armed Services Committee..
“The stem scarph is identical to what we know from the plans of Endeavour,” Australian marine archeologist James Hunter said on the group’s website. “It’s also a very unique feature. We’ve gone through a whole bunch of ships’ plans, lots of 18th century plans, and we can’t find anything else like it.”
sounds like pretty good evidence along with the other matching measurements