[David_Hayward (RIP)]

My little book gives all the civilian models and some have various suffixes after the model number, and different capacities for each variant. I suggest that A and B are derivatives...not as with GMC Model Year introductions. I believe that these model numbers are allocated engineering / design model numbers per each contarct and were allocated in sequence. Nothing more nor less. I have Chrysler's US and Canadian Government orders and if I recall correctly there is some correlation between military and civilian models, and in some case none at all. Now I think about it there is no correlation between the 1935-on civilian GM of C model designation series and the 1940-4 CMP system! There is however some association between Ford CMPs and civilian models and considerable association between Ford MCP and civilian models.

I suggest that there is no system involved with Diamond T... contracts placed resulted in the next project or model number being allocated in sequence according to chronological order. Though I may well be wrong!!!!