Between 1940 and 1942 Officers assigned to the new armored forces were to wear cavalry or infantry collar insgnia. Some of these men choose to wear the small pin of the M-3 Tank. This is a museum reproduction of this unofficial collar insignia from the early days of the Armored Divisions. In many cases when you one of these list they are sold as sweetheart pins and not as collars. These are rather hard to find. Here is a set of two in sterling silver.