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Model O Machines serial # either ends in H4, C4 or may begin in C04

Model 1 Machines serial # either ends in H8, C8 or may begin in C08

Model 2 Machines serial # either ends in H12, C12 or may begin in C12

Model 3 Machines serial # either ends in H20, C20 or may begin in C20

Model 4 Machines serial # either ends in H26, C26 or may begin in C26

Model 30 Machines serial # either ends in H30, C30 or may begin in C30

Model 5 Machines serial # either ends in H36, C36 or may begin in C36

Note: Machines ending in “H” require old style spacers; machines beginning or ending in “C” require Cuboid Spacers.