I visited your web site. You should treat yourself to a good camera! You'll clearly put it to good use.
The thing about bellows is they are basically consumables. Sometimes it takes a lifetime to consume one... but often not. I went through three sets of used bellows for Toyo cameras (a rail camera -- not the one you're looking at). All had light leaks that made them unusable. I also went through the whole "cycle of bellows repair"; in my experience, the cycle begins with hope and optimism and ends with sadness and frustration. After a huge effort I was able to "repair" the best of the Toyo original bellows, but it ended up a somewhat goopy mess with poor long term prospects. I bought a new bellows from the Hong Kong bellows maker on eBay; the second version is great and I now have light proof bellows on my camera.
All of this is to say there's a chance the bellows on any used large format camera are leaky and may need to be replaced. Does the seller "guarantee" it's light proof, and will he/she take it back at seller's expense if it's not? Are you willing and able to replace the bellows yourself? One thing a Chamonix camera has going for it is it's new (or newer), so too the bellows.
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