Recently pieced together this old pneumatics set from 1984 from a used lot so I thought I would compare it to some of my more modern pneumatic sets : r/lego
LEGO Set 8851-1-b1 Bulldozer (1984 Technic) | Rebrickable - Build with LEGO
Excavator - LEGO set #8851-1 (Building Sets > Technic)
LEGO+TECHNIC%3A+Excavator+%288851%29 for sale online | eBay