A treadle Pfaff - if it's what I think it is, it could be quite valuable. BTW - they were built in Germany. Now, it it's just a 130 put into a treadle cabinet (they fit in singer cabinets just fine) then that is a different story.
BTW - I consider "valuable" for a vintage machine to be something worth over $200. It's a relative thing - most are worth less than that.