Ed, and Assembled Galooterati:

If I may indulge in a bit of whimsy regarding how the eBay seller arrived at the
$344.50 Buy it Now price for the Goodell-Pratt No. 800 vise:

$100 -  Original two-color japanning 
$200 - Collector Lust for the intact decal
$20 - Gizmocity Factor of the quick-adjust mechanism.
$14.50 - Actual utilitarian value of the vise
+
————
$344.50

Have I got it about right?

Whimsically Yours,
John Ruth
Metuchen NJ
Sent from my iPhone