Patent REXOS Automatic Spanner Wrench
A very good REXOS automatic spanner.
Marked '"REXOS"' to one side of the head with 'PATENT No19234/1910' on the opposite side.
REXOS automatic spanners were produced in Whitworth sizes with this spanner being a 3/4 example.
3/4 Whitworth is approximately 15/16 inches or 33mm across the flats.
The patent relates to the hinged design which removes the need to lift the spanner off the bolt during use, similar to the benefits of a ratchet spanner but for open ended spanners.
This one appears to have seen little use with only a few minor surface knocks and scratches, please see images.
A touch under 12 inches overall length.