The HP-19C and HP-10 had a unique feature, the decimal dots in their displays had the HP logo on them. Given the size of the dot and its high contrast wrt the background, taking a good picture of the dot has so far proven to be almost impossible.
Now ji (of http://www.tla.org) has taken some excellent pictures showing the dot, and also revealing that the display had another dot allowing it to display a : (why?)
**vp
Edited: 24 Oct 2005, 11:55 p.m.