Hello,
I used to have a 205-25, really not of much value...
the have a drop feed dog, but not needle feed. They're sort of good for sewing heavier items, but without needle feed or unison feed, it's not really good for general leatherworking.
I used mine to stitch small leather goods that didnt put a stress or load on the feed system.
Basically a 205-25 is worth about $400....but nobody seems to really want them.