Farmall 400 serial#

Can Any body in farmallland tell me what the letters A S T after the serial # Means ?This is a 1956 Farmall 400. Thanks for any help!!
 
The T means it came with a low drum cotton picker attachment, S means TA with provision for a 540 rpm PTO, A means it has a distillate engine. In other words it came from the factory as a distillate burning cotton picker tractor. The use of distillate was somewhat unusual in late 1954-1956 when it was built, as there was no gasoline shortage. It may have been intended for export.
 

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