V-Belts / Progressive Refinements

Date Introduced	Chassis No.	Unit No.	Modification
7 Apr. 1949	100 615	131 840	Modified stickers, new markings^[1]
May 1949			Red marks for adjusting belt tension^[1]

Notes

↑ ^1.0 ^1.1 “Engine, Clutch, and Heating System” In Progressive Refinements 1940 - 1961, M-2