First calculator with gamma function ? HP or otherwise ?

[Gene]

and, looking at the good picture of the SC60, I notice another oddity.

Between the 0 key and the = key, Kingspoint decided to place the X^Y key.

Usually, the +/- key is near the digit keys, but they decided to place the powers key in a very prominent position and put the +/- key up in the smaller keys (on the fourth row from the top, fourth key from the left).

That's a very odd choice IMO.