I've recently acquired the pictured slip cap 1500. This was my first Swan (funny place to start I suppose), but I've also picked up very nice 3162 since. Save for some discoloration of the cap and a missing clip, the pen is in excellent condition with nice, hallmarked 9k bands and a flexy stub/italic nib. I'm having a bit of trouble getting it writing reliably though.
After a fill, a few taps on the paper and the ink starts up. I can write a series of loops for a while, then the flow stops completely. A few more taps and it starts up again for a while. It seems particularly unreliable on straight downstrokes. The feed is clear, but I'm not sure where to start
Any thoughts? I've just noticed after taking these pictures the the nib gap might be a bit wide. Could that be it?
A couple of other questions as well, if I may.
I've guessed this pen dates from around 1910. Would that be correct? Also, as the feed and nib don't completely fill the hole in the section (I can clearly see daylight when looking up through it with the barrel off), what stops the ink just dripping out?