markings question TR4 (Triumph SCT-65)

["tom boggiano" <boggiano@charter.net>]

I finally did the negative ground conversion on the TR4 and it went very
straght forward. The PO had mounted a voltage converter to allow a modern
radio to be installed mounted on the firewall by the body number on the RH
side. When I pulled out the converter there was a plate rivited with Triumph
STC-65 stamped on it.

Any idea what it is? .

Tom