I have just acquired this one. It came with a 1950s Swan nib (witht he Swan wrapped aorund the breather hole). I have installed the correct nib which I was fortunate to possess..
No model number of course. As may be seen, the cap has the late 1930s type clip arrangement with the BHR ring and the little Swan emblem embedded, found on L212/60, L445/60. L645/60, 0160/1060/2060 amongst others, and some of the Snakeskin and Lizard skin models.