This is a new production master cylinder. Cylinder Spec WEBCO Brake & Clutch in Peekskill, New York. Many cars are now 40 to 80 years old and may have been modified over the years.
After putting this Master Cylinder on my 1954 International R110 pickup I ordered another one for future replacement if not by me then the new owner will be happy not to have to find a Master Cylinder replacement