Circa 1930s and colloquially known as a "1912" model. It's a common combination with the chain link handle, but very nice nevertheless. Grab some blades from Connaughts and get shaving with it - my favourite razor.
thanks Paul, i have some GEM Stainless Coated Single Edge Blades on order, hope these are the right blades. it was the handle that caught my eye, and the rather drab black bakerlite case lol.