It is a Diplomat Excellence 'A' in highly polished chrome (medium nib).
http://www.thepencompany.co.uk/product/diplomat_excellence_a_fountain_pen-chrome
I have used it for 5 minutes from new and found I couldn't get on with it so it's as near as damn it brand new.
Complete with presentation box and bottled ink adaptor plus a few cartridges.
£50 anybody?