Originally Posted by
saraw82
Mostly looking to find out how to figure out what size bobbin!
Welcome to QB Sara.
They both look like 1960s Japanese clones. The second uses long shank feet (industrial), the first short shank (extremely common for domestic machines). I'd first of all try out a class 15 bobbin (the one with the holes all the way round). If that doesn't fit, try a class 66. The 15 is bigger so if it fits, it'll be the right one. If it's too big, the 66 is a little narrower.