Not sure if this is helpful, but I often find Google image searches 
to help me find stuff like this.  I would search "hand ratchet" or 
"finger ratchet" possibly adding "reversible" and then scan the 
images until you recognize the one you want.
FWIW . . .
- Mark

Mark van Roojen
POB 83836
Lincoln, NE 68501-3836
(402) 438-3724  (h)
Webpage: www.mvr1.com