This is a Ministry of Defence (MOD) 'BRITOOL' spanner, manufactured in 1953. On this one, I am preserving the age of the tool and adding some patriotic highlighting. I don't have ready access to the room-temperature liquid bluing chemicals (which are expensive over here), such as Tru-Blu, so am reverting to the age-old technique of hot-bluing (in this case using waste motor oil); this involves heating the work-piece until it takes on a straw colour, then a blue tinge, then quenching it in oil - by having an initially polished surface, the resulting finish is a nice blue sheen.
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