Precision 4-Sided Machinist Straight Edge 320mm / 12.6" USSR Grade 1

Description

Precision 4-Sided Machinist Straight Edge 320mm / 12.6" USSR Grade 1
New old stock! Still in grease and oiled paper!
Please see actual photos. With documents, with box.
Original pictures!
Manufactured in USSR (great quality)
Length: 320mm / 12.6" ; 20x20mm
Grade 1
Straightness tolerance 2.5µm=
0.0025mm=0.000098 inch
(GOST 8026-92)
Roughness 0.04 Ra, Hardness 59-61 HRC
Weight: 1.55kg
Has slight dark spots on one of the surfaces.
See the picture, please...