mason

[arthur]

Mason on front of the jar printed in a slight tilt with some kind of mark underneath and roman numeral IV on the bottom

 

[madman]

hey art nice i dug one in a early 1900s dump mike

 

[glass man]

Wonder if the mark underneath is a mistake?

 

[karis66]

Hi Arthur that mark underneath is call a squared shepherds crook, i believe it is listed in
RB 9 # 1633 List price 8-15 dollars
There is also a rounded shepherds crook i don't believe that is the mark on your jar nice jar it's a keeper Kari