Hi all, I have been selling items from an estate and you may have seen some of them on here. I have a group of NOS timing chains from the 20-30s that are likely really important to someone but I have no way of knowing what they are. They are "link-belt" brand and are in their original boxes. Does anyone have a way to look up the part numbers and help me identify these? I have not been able to find any book that lists them. Thanks, Linus