Dominion lock 62HB master Key blank.  The Dominion keys have the look and feel of the original Yale keys at a fraction of the price.  Fits all R-R and Bentley cars from 1955-69 including:

Silver Cloud I, II, III

S1, S2, S3

Silver Shadow up to 1969

T1 up to 1969

Rolls-Royce part cross reference: RH7486