50yr old pair of glass beer steins

Description

My father purchased these while he was in Germany for his employer in the late 60's/early 70's.  They have never been used and have been in a box since he bought them.  If I had to guess, these were likely purchased in Nuremburg.  I'm sure they are in the same condition it was the day he bought them except for the lids may be tarnished a bit due to their age?  I don't know what they looked like new, so can't say for sure.  I have not been able to find a matching one anywhere online (I didn't spend too much time looking).  There is a faint imprint on the underside of each lid that I did my best to photograph.