The first Short-Arm proto chassis
These came with the motor having a straight cut wire soldered from
the motor frame to the motor contact tab, which was still flat

Chassis Body Rev Type was C

Medium size Fonts
Blank Base
No Slots on rear of base

z z
Pic coming Soon
Long Arm - Contact between the switch and motor
Contacts glued, not riveted to the chassis

All known Chassis are Tooling Revision C
Tool numbers 1 through 4 are expected