does anything except leBlond use 5 tpi?

I spend waaay to long cleaning up a 8 inch 4-jaw chuck that had been in a fire - looked like it was all set for my lathe, then I tried it and it didn't fit --- after a bunch of measuring and research, it turned out to be

2 1/8 X 5 TPI, and as far as I can tell, that only fits LeBlond - is that right? or was this rather odd thread used by others?

here's a link to the ebay auction where I put it hoping to get rich...... (ok, hoping to get it to a new home)