Name That Tool

I've seen this kicking around the place many times in my life, just ran across it yesterday while attempting to straighten the place up a bit.

I have no idea what it's for, but in checking it out closer I found out it has a few patent mentions, earliest is 1880! The only thing I know about it is that is was my grandpa's (born in 1900)...

Attachment 325843

handles at rest
Attachment 325844

handles closed
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the screw moves the anvil
Attachment 325846

Attachment 325847

Attachment 325848

It is a saw set. For setting the teeth on handsaws.
Bring this up in the neanderthal forum and watch the answers come falling out.

Looks like a Morrill saw set

eBay item# 201350805261

Yes, it is a saw set.

You can search patents by date at:

http://www.datamp.org/patents/search/patentsByYear.php

jtk