Earliest handheld / battery calculator with hyperbolics?

[Steve Simpkin]

It appears that HP's first handheld with hyperbolics was the HP-27 introduced around Jan 1976, two years after the SR-50.

Edit:
Demosthenes wrote to me and mentioned he thought the HP-32E (introduced in 1978) was the first HP handheld model with hyperbolics. I was going by the features listed for the HP-27 on this site.
http://www.hpmuseum.org/features/27f.htm

After looking at the pictures of the HP-27 keyboard, I don't see hyperbolic keys like I do on the HP-32E. I think that Demosthenes is right and the HP-27 features page is wrong.