經查該公司1922更名為COOKE, TROUGHTON & SIMMS, Ltd. 1963再改為Vickers Instruments, Ltd, 因此年代為1922-1963 After checking, the company was renamed COOKE, TROUGHTON & SIMMS, Ltd. in 1922 and later changed to Vickers Instruments, Ltd. in 1963. Therefore, the dating of the instrument falls between 1922 and 1963.