Wow Brent, that’s gorgeous!  What a great find- (both the son in law, and
the Mike!)  And that size is probably the most useful size.  These are
basically bullet proof, about the only thing that can go wrong is that you
have to adjust the zero point.  It’s really just a precision thread.  I
have some old Mikes - Lufkin, B&S, Starrett, and Moore&Wright, many of them
old and abused, and they’re all still accurate.  Did it come with a
‘standard’ ie a bit of steel rod of known length for calibration?  My newer
one has a plastic insulation on the standard, I guess to control for
thermal expansion?

You know, I am almost always impressed by the quality of Miller’s Falls
tools.  I like MF drills and planes, and they’re often much less expensive
because they don’t say “Stanley “.    Whenever I pick up one of their
quality tools, I wonder why they didn’t make it?  I guess quality isn’t
going to always win in the market place?  There’s a lesson there somewhere.
Cheers from Waterloo
Claudio (very happy to be at home, finally!)