18b Caterpillar Bulldozer, issued 1958, length 50mm, box type B.
18c Caterpillar Bulldozer, issued 1961, length 58mm, box types B-C and D.
18d Caterpillar D8 Bulldozer, issued 1964, length 62mm, box type E.
18e Field Car, issued 1969, length 67mm, box type F.
The 18c models notice the difference between the drivers, and the two exhausts.
The tall and short exhausts, also two colours of Yellow.
The two different bases.
George T.
) who had a tray full of 18A models with axles that had never been crimped. That collector was kind enough to sell them off to other collectors and one found its way to my shelf:
)