I bought a fork on ebay advertised as "absolutely, positively 700c". It's a 1", threaded, steel fork with canti bosses and fender eyelets. Just what I needed. It also had the crown drilled to accept caliper brakes.
My commuter bike's a Fuji Touring, with 700c wheels with canti brakes. When I placed the new fork placed it next to the one currently on my commuter, the dropout-to-crown length was the exact same. I noticed the canti bosses on the new fork were much lower. So I slipped a spare canti arm on and inserted a 700c wheel, and sure enough, the pad wouldn't reach the rim, even with the shoe positioned all the way up the slot. I installed a 26" wheel, and sure enough, the pad hit the rim perfectly.
Is this an oddball fork, or did they actually purposefully manufacture "dual-use" forks".