RARE Genuine Smiths Chronometric nacelle style Speedometer to fit 1963 Triumph 6T Thunderbird 650 first year unit twin. Smiths model SC3304/12. Extremely hard model to find! Speedometer has been completely restored to as new condition by longtime smiths expert. May also work on other makes and models as well depending on ratio. Great for factory correct restoration where it has to be 100%. I have many other smiths tachometers and speedometers as well. Email me with any questions.