Britool Tools made in England 9/16" X 5/8" whitworth Open Ended Spanner. Model number 6J101110.  Ex British military tool with bit of military engraving. Please take the time to study the pictures carefully as they form part of the description. Check out my shop listings for lots more Britool and other old school quality tools and quirky collectible items. 

Happy to combine postage wherever possible.

#A6(CF)