Brother Dollock

Chipping away at a few refurb tasks during lockishdown, and thus I'm rescuing yet another door lock from disappearing under many layers of paint.  However, in this case I was pleased to find a maker's mark on the inside.  

Nothing much out there about the company though I did find a label/advert on eBay re. 1913 Lingham Brothers, Lock Works, 131 & 132 Great Hampton Street Birmingham.  "Contractors to H.M.Government, Home, India, Admiralty and Commissioners of Prisons". Hmmm.