Iowa 80 Trucking Museum #5

A little Google research says this is a 1920 Mack A C chain drive tractor, the windshield does not seem to have been made in 1920, must be a modern add-on? The solid rubber tires must have some heavy miles on them, sure are worn down. But it surely is a beautiful restoration.
The Dozer on the lowbed appears to be a 1926 model Caterpillar.

I'm working on solving all your truck puzzles. I bought my first pickup in1976. I love old trucks! Thanks for posting all these wonderful examples of real trucks from back when a truck was a truck and not a car with a beer cooler bed!