Nice Rock Shox "SID SL C3" Dual Air cantilever or v-brake mountain bike suspension fork. 1 1/8 threadless steerer tube.
Steerer tube is 7 (179-mm), threadless. Cantilever or v-brake, for 26 mountain bike wheels. Original blue, with all the decals. Still plenty stiff with plenty of rebound, works well, has some normal trail wear on it. Hard to find fork for your vintage mountain bike.
Take a good look at the pictures, that is what is included. This item is in the category "Sporting Goods\Cycling\Bicycle Components & Parts\Forks". The seller is "mtwitney" and is located in this country: US. This item can be shipped worldwide.