Those are pretty uncommon sprockets around here! I have had tons of S25 saws through my hands and never seen those .325 pitch sprockets for them in person. I think they were a Canadian thing.
They have been on shelf up here in Canada. A old friend of mine l grew up with , his father had a saw shop and those sprockets were probably bought brand new from our distributor here in northern ontario.
l acquired alot of inventory when it was closed .
You would probably know alot more than me about were they were marketed. l really do not have the answer to that.
l know though that they are listed as such in the ipl's. But nothing info l know of mention were they were exported to.
lts neat what shows up from time to time!
No I really don't know much about it either. I have a Poulan 2400 IPL and thought it strange they gave a S25 a 2400 model designation in Canada and remember then they used a .325 pitch sprocket on them.
I'm figuring they still could be used with a common K041 mount bar. I'm not planning on messing with any more S25's or I would try it.