Bill Ghio asks:

[snip-- mortise gage w/wooden slider]

>Any one seen one of these? Who made it? When? Should I use it, or is this a
>rare artifact?
>
>Ralph, are you out there?

Ayup. ;-)

Has it got a brass screw and moustache?  If so, you've got a Stanley #68--
not the rarest of the line, but not too common either.

If it has a plain beech head or the moustache and a wooden screw, it's
probably a Stanley #67.  These are rarer than the #68, but still not
tremendously rare (rare enough to avoid being in my collection, though).
Stan Faullin stole one of these out of Pat Leachs $10 heap at Columbia last
year, and reminds me about it every chance he gets...

Check out:

   http://www.mcs.net/~brendler/oldtools/gages/67.htm
   http://www.mcs.net/~brendler/oldtools/gages/68.htm

ralph