Super dooper vintage 9 carat gold replica of a Wilkinson Sword razor blade.
Probably made as a company gift.
Goes onto a chain easily but you could also hang it from a gold bolt. 
Measures - 43mm x 22mm 
Weighs - 8.54g
Condition - excellent (there is a stain from testing fluid which I will get removed)
English - first half of the 20th century?