Thank you gentlemen.
So that was a surprise, Scott general does not list "postal cards" ?
not that I could see, No "UX" at all.
Digging out (what I should have done in the first place) Moderator Kirk's FREE gift of 2004 US Specialised, I see them
I have UX62b (PC390 Variety : Orange omitted on back)
So there we have it....what is considered front or back with a Postcard !