The condition of this film back is very poor. The sides are roughed up. The Arca Swiss Polaroid Film Back for the 500C can hold 107/108 film. This Film Back was made was machined in Switzerland.
There is a pack of FP-100C film inside of this film back, that should still be good but it can't be guaranteed it will fully expose. This was Braedon's (Film Supply Club founder) and it's his film inside - so it's not too ancient.