Some years ago I managed to pick up a 310 with the original globe and only after reading around in this forum did I realise how fortunate I was to do so; at the time I knew nothing about lamps and just liked the look of it when I saw it in an 'antique' shop. I then managed to get my hands on another 310 but without the globe so have been on the look out for one ever since. Off a well known auction site I managed to pick up the globe that was in a 315(?) lamp so now can get the second 310 up and running once I acquire the service kit from the Fettlebox.
The two globes are functionally interchangeable - the later, angle-shouldered globe fits the 310 although it doesn't look 'right' IMHO...