https://worldwide.espacenet.com/publ...0925078A&KC=A#

This is a link to the patent abstract. The cylinder locking device was invented by Tonks, then trading as Tonks & Sons, E., and Tonks, R., afterwards, 'ETAS'.
It is a wafer tumbler lock, made before pressure die-casting made other versions of this idea easy and cheap to mass-produce, so is probably rare. Looks like another attempt to compete with the Yale cylinder nightlatch, as this is 1909. Probably not a success in the market place, with few survivors.