More Chain Pliers

[lptools]

Hello, I have been cleaning & sorting the tools, and I decided to get these out. The 2 at top are St. Pierre No. 4, similar markings for size, noticeable difference in weight, top is 4 lbs. 3 ozs. , second from top weighs 3 lbs. 5 ozs. Early vs. later manufacture? Lighter stronger steel? 3rd from top is unmarked, at first I thought the handles were added, but they seem to be factory? Next is a smaller St. Pierre, and the next 2 are unmarked. At bottom is another, smaller, St. Pierre.  At bottom right are 2 made by Schriver, I think I may have posted a photo before. Regards, Lou