Fitted to TR6 from CC75001
13H7761 / Lucas 39748 159SA type switch
This dashboard mounted twin speed 4 terminal switch operates the wipers.
Often also fitted to earlier TR6 in place of the Clear Hooters one (13H7761 151431) which is longtime obsolete. However it is a smidgeon larger which isn't a problem for the wood as its fits the standard dash aperture of 22mm by 50mm, but you will probably need to file out the metal backing plate to fit.
Also fitted to a wide variety of 60s & 70s classics - close up pic of the terminal arrangement are shown for you to decide if it is suitable for you.