Re: Eifel pliers. There are 5 distinct types. The first is a 1 yr only 1920 and 8" with smooth handles. @nd is 1921- 8 1/2 inch 1 maybe 2 yrs. #3 is the one with angle cut gears and was made from ca 1923 to 1932. these 3 only had 3 sets of jaws. the 4 th type has many type of jaw sets over the years and was made by several mfrs and still made today. many different markings with the early ones being marked with yr & month of mfr. These have all markings roll stamped while previous 3 are forged marked. The 5th style and is 7" and has 3 sets of smaller jaws. Chuck Garrett
A little clarification on this list.
I believe these versions exist:
1920
1921A
1922B
1923- November 1924 (Look like the World Flight Version with straight gears)
December 1924 to 1932 - World Flight Version with angled gears
1933 to early 60's - 7 and 8-1/2 in versions
1960's to early 70's VACO
Mid 70's Masterform
1980 - Nopak
The differences in the VACO, Masterform and Nopak versions are slight compared to the 1933 version, but the jaws often aren't interchangeble due to width.
I have some of all of these. I will post photo's once I get home this evening.