PYREX ® 75 mm Diameter Plain Watch Glass/Beaker Cover
1 piece, borosilicate glass, smooth edges, thick

cat number Corning 
Made in England

No return, no refund.

Please contact, if you are looking for different diameters or kind - I have many not listed yet.
I have also 3 pieces of thinner watch glasses same diameter. 

These watch glasses possess high chemical durability, thus preventing contamination of solutions. They are molded to the same radius of curvature for convenient stacking. The heavy wall and ­uniform fire-polished edge provide mechanical strength. The outside diameter cannot be controlled within close limits and a slight degree of out-of-round can be expected to occur.
PYREX® borosilicate glass.
  • High chemical durability
  • Prevents contamination of solutions

These 75mm diameter PYREX® watch glasses are designed to fit250 mL PYREX® beakers. They possess high chemical durability, thus preventingcontamination of solutions. They are molded to the same radius of curvature forconvenient stacking. The heavy wall and uniform fire-polished edge providemechanical strength. The outside diameter cannot be controlled within closelimits and a slight degree of out-of-round can be expected to occur.

Compare to:

https://ecatalog.corning.com/life-sciences/b2c/US/en/Glassware/Tubes%2C-Glass/PYREX%C2%AE-Watch-Glass/p/9985-75

Compare also to:
us.vwr.com/store/product/4596944/pyrex-watch-glasses-corning
or
ecatalog.corning.com/life-sciences/b2c/US/en/Glassware/Tubes,-Glass/PYREX®-Watch-Glass/p/pyrexWatchGlass