T0586 is the type code (see below)
001,001M is the serial number Identification Codes for SN under 10,001 (1968 models) Note-- Some codes are used that mean different things in different years, so you must have the serial number to figure out the proper code.
Code Tires Engine Hydraulics
T0581 GT-3 12K H-1
T0582 GT-4 12K H-1
T0585 GT-5 12K H-1
T0583 GT-3 12K H-3
T0584 GT-4 12K H-3
T0586 GT-5 12K H-3
140