Posts: 653
Threads: 26
Joined: Aug 2010
All cards for the HP65, 67/97 and 41 have the same size (something like 71,1 x 11,3 mm - maybe someone has the offical specs), and AFAIK any of these can be used in any calculator.
Looking at the picture I see one card with the classic HP65-layout and another one that looks like a card for the HP67/97/41, just with only one clippable corner instead of two. So there are also no marks and arrows indicating side A and B. To me this looks like a late HP65-card with the newer design that afterwards (and/or at the same time) was also used for the dedicated HP67/97/41 cards (that fit the HP65 as well). I'm sure someone here will have an exact answer. :-)
Dieter