I always carry more than one knife on me, but what I consider gentleman's knives are:
SAK Classic, Minichamp, or Executive.
Spyderco Ladybug or Ladybug II (the latter is on my keyring).
Cold Steel Tuff-Lite (flat-ground clip point, one and 7/8-inch long blade). I got this to replace the LadybugII on keys when air traveling.
Spyderco Calypso Jr. Micarta.
CRKT Classic Kiss. This one is shiny finished, made in Japan, chisel-hollow-ground clip point blade. Locks up tightly, thinner edge.
I was pushing it with the Calypso Jr. At Christmas, a comparable-sized knife, the SS-handled Rookie, was used to open packages. Some family members were nervous and referred to my "huge" knife!!
(it's actually smaller than a Delica).
One more good gentleman's knife may be the Spydie Dragonfly.
Jim