I have a Wollensak 90mm that should be 25mm thread. I actually have a pair of them, and use one all the time for all my MF up to 6x9. According to Wollensak, it was designed for 6x9.
Oops, sorry, just checked, it's 30mm. I have a Schneider 50mm that's 25mm.
I have a chrome 75mm 4.5 Durst Componar, and a black 80mm 5.6 Componon, both by Schneider, that are in exc. cond.--clear glass, no oil, fungus, or haze. It would be $35 for the 75 & $45 for the 80, shipped to you. Chip
Thank you chip. I didn't see your reply until after finding one on fleabay. I got an old black Componar for a little less. I'm sure your Componon is a better lens, but the Componar is probably "good enough" for my toy camera negs.