[SEL] What is it?

[Bill Dickerson]

My former boss gave it to my father to give to me as a gift (I've
"inherited" a LOT of the tools we used to use when I worked for him in the
mid70s)

He called it a "piston vise"............. ?
This is one tool I don't recall, but he ran an old shop and had a lot of
stuff from the 50s and 60s, and I bet some stuff from earlier.

http://antique-engines.com/images/misc/vise-001.jpg
http://antique-engines.com/images/misc/vise-002.jpg
http://antique-engines.com/images/misc/vise-003.jpg
http://antique-engines.com/images/misc/vise-004.jpg

Bill