Vintage and from the same estate sale....
 
HARD TO FIND PUSH BUTTON AND LOCK LEVER DESIGN!
 
Imperial RI USA single blade pearl cracked ice handles pocket knife.
 
Condition:  Handle has no cracks or chips.  Still has the loop.  The blade has some signs of age but should polish up it wanted.   Lock and push button work.  The blade needs some oil as it needs help unfolding once the button is pushed.  Lock lever works as it should.
 
2 1/4" not including the loop.
 
Location E2