For Jory- if you are actually going to treadle on this machine, make sure it has complete functional movement. Even if you have to tie shoelaces as a temporary belt.
Make sure that the machine operates smoothly. For that age machine you will have a long bobbin- make sure you have a bobbin case and some extra bobbins.
Look up the serial number on the machine- I take my ipad or iphone and do it right there.