The picture shows a view of the (2) Different Old Bulldozer Neck Tie Bars in this lot. These are not dated but they are old. They appear to be made of brass. Each has a different bulldozer on it and the tie bars are also made by two different companies. They are marked on the two sides as follows:
ALLIS - CHALMERS MERCURY INDUSTRIES
LEAVENS ATTLEBORO
To judge the sizes the larger tie bar measures 2'' wide. These appear to be in excellent or better condition as pictured.