I kniw halftracks fairly well and I have never seen a number like this before. White numbers begin with a 2------- all autocar numbers and dia. t and international cars begin with the type of car it is like M3-____autocar numbers are abuot 3/4 inches tall, dia t numbers are about 1 inch tall. I have restored 15 cars frame up and our collection contains 26 cars, personel to gun motor carriages. Most m-3 cars in the U.S. are autocars there are a few dia. t's. If you would like more detailed info on the diferances between each manufactures write me. Roger
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