I am listing several pieces of vintage machinist tools and gages all from the same estate. This one is a complete 1983 Fowler 81 Pcs 53-672-081 Precision Rectangle Gage Block Set with COA and says its Economy grade and has a .000001 +/- Var. which is different from most I have seen on Ebay that have a .00005 (50th millionth) variation. It comes in wood case and blocks have just some light wear/ scratches but are all there. Each block is stamped with the size and I also apologize for the 10 day auction but will not be here to ship the items and i have it set up for guaranteed next day shipping. Please check out all the photos and if you have any questions, please don't hesitate to ask.