TR4 identification

[Bob <rlmcneit@cpis.net>]

I've got an interesting identification tag on the passenger side the 
engine compartment, right next to the chassis number.  The problem is, I 
don't know what it means.  It's a green plate, and it states "STC-65".  
Most folks I've talked to so far don't know what it could possibly mean. 
 Does anyone out there know?      Bob      64 TR4