STARRETT HARDENED STEEL MASTER SQUARE No 20 12 Inch 12" VG accuracy inspected

Description

For sale is a STARRETT, HARDENED and Ground STEEL MASTER SQUARE No 20 (extreme accuracy) 12"  , 12.1" x 5.1" (inside measures), With the wood case. This is in good condition. This looks older, so there is some discoloration.
I set this up to inspect it on top of my 24" Starrett master no 20 square(see pics) and it looked very good with only a tiny shimmer of light coming through(see pics), even with a white background. I stoned the surfaces and did not feel any nicks at all. The no 20 Starretts are rated to be within .0002" per ft in squareness on the blade edges. These are the best of the best
. This one looks to be very good in accuracy.  This has  a company name engraved on it(see pic). MSC has this 12" for 0 new, without a case.
This is very good, high precision grade square that checked very good(within about .0002" I'd say) as accuracy to my
24" Starrett
Master square.
Thanks for looking