Vintage Italian Switchblade Knives
Folding Guard Stilettos
This one is 6-1/4" open.
This one is 7-1/8" open.
These three are 8-1/8" open.
This one is  8-1/4" open, but has the larger handle with a shorter blade for sale in Germany.
These two are  9-1/8" open.
These three are 11" open.