Bet it is photo polymer letterpress and maybe started out as Illustrator art work.

I think you are correct Bob. I have been collecting interesting ampersands for years and I don't have this one.
But there are now many well styled fonts that would harmonize with this ampersand, so I will keep an open mind.
BTW, I like the design. Worth including in an appropriate swashed Roman with similar terminals.
Don

I agree Don, it is a very nice variant on the ampersand.

So, do either of you have a suggestion as to what the base font might be (I suspect it's a custom creation, but it has to be based on something)?

After editing out the swash, Seravee is the only near match that I could get (and it only comes somewhat close):
http://www.myfonts.com/fonts/stawix/seravee/

Maybe started with a reversed 3 - I will look into that.

you guys are like detectives. :P
I found it here: http://www.beastpieces.com/2011/12/an-oversized-wedding-invitation/