I was given some size 10 crochet thread in a plastic box. Looking closer, there were 6 metal bobbins. some are solid around and standard size and a couple have holes around the top. They had belonged to a woman who had reached the age of 100, so perhaps they also are old. Does this sound like something belonging to these old machines? I would be happy to mail them off. They all have thread on them at the time but that is easily taken off. Free to first one asking, after I find a padded envelope to put them in. I will ask hubby to take a picture of them if that is desired.