I regret (in a way) that I was unable to resist this beast. An early large Leverless with No 6 "keyhole" nib. It is difficult to make out the model number but I think that it is L600.60. The feed and section are stamped L6. I assume that this pen dates form 1933/4: it has the screw method (aarrgghh!) of securing the paddle mechanism - found only on the early pens. Rgds Cob