MALLET patent lock

[chubbbramah]

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.

[chubbbramah]

Mallet was likely a large retailer. Early in the last century, Yale badged locks for several large retailers. Some of these had started out as ironmongery makers, but gradually moved to having products made for them and badged for them. Suffolk company Comyn (now Comyn Ching Architectural Hardware) was an example. Even in the 19C, some makers would affix round stamped disks with a retailer's, rather than the maker's name.