We collected original hinges dating from the 1870's and faithfully reproduced them in cast iron.  They have removable pins, and are black powder coated to last for generations.  Sold Individually.
We have a full range of sizes: 
 
2" x 2"
2" x  2.5"
2.5" x 2.5"
3" x 3" 
3.5" x 3.5"
4" x 4"