TR3 Disk Brakes

["Paul G. Wiegman" <pwiegman@ix.netcom.com>]

At the Pittsburgh Vintage Grand Prix 3 TR3's turned up, all with disk brakes.  
I also 
have a TR3 with disk brakes with a commission number of 14551L.  All the others 
had 
commission numbers higher.

The question is when the change was made from drums to disks, and what and 
where is the 
oldest disk brake TR3 in the US now ? 

Paul g. Wiegman
Allison Park, PA
1956 TR3