100 tooth saw blade anyone?

I'm looking for a 100 tooth saw blade - any size up to 9" (smaller is preferable though). Will not be used for sawing anything! So it can even be very rusty or have buggered teeth. I'll be using it for indexing to mark scales on handwheels (in 100 divisions). So the only thing REALLY important is that it has 100 teeth exactly :) It turns out that the shape of sawteeth is the ideal shape for rapid indexing for this purpose.

Will post pictures of me doing it when I get going.