It looks like a piece of machinery belt, only softer. I'm thinking about 1/4 or 3/8" thick, but not real sure. There are two styles, one piece is before 50, two piece is 50 & later. However, my 52 has the early style.

[img]http://www.americanclassic.com/images/RDR-23.gif[/img]

[img]http://www.americanclassic.com/images/RDR-26.gif[/img]


Fred
52 3600
69 C-10