Myers valve, marked M on red and black end caps, '-Made in Canada-' on glass envelope, (RMW/D127A - McVitie Weston number), by Myers, E.B. Co. Ltd., 1924.
Myers valve, marked M on red and black end caps, '-Made in Canada-' on glass envelope, (RMW/D127A - McVitie Weston number), by Myers, E.B. Co. Ltd., 1924.