The second model has a four- barrel hinge as well, but the plates are moved to the inside of the case. The patent #2032695 was issued March 3, 1936 , so lighters manufactured only late in 1936 had the patent.The brass drawn case with no metal clips inside the lid makes its entrance.Lighters produced today are made the same way with the extended hinge.Black crackle models made of steel with a four-barrel hinge are only produced this year. The first is the one which is used allready 1941 , the second has the " date-code-error" , which lost the 2 in the middle of the pat.number.The third one has the Zippo logo written taller than the other ones.Zippo fabricates cases made of nickel-silver alloy between 19.
It has one piece extended from the hinge that supplants the metal clips.This variation with the flat bottom is only produced in 19.Blaisdell produces first square-cornered windproof lighter with no diagonal lines on the corners.This model is 2-7/16 inches tall, 1/4 inch taller than the now standard Zippo lighter. The Zippo have eight holes ,located on each side of the chimney and a three-barrel hinge outside of the case.
These new Zippo lighters featured a canned bottom and an overall rounded look , still seen on current models.
The 1946 model has a case that is 1/32 of an inch taller than the cases today.