Nice find. Especially with that nib.
While all in all I prefer the Aerometrics because odds are good that if you find one it will just need to be flushed out, I must say that if I have to do a LOT of writing at one go (such as for doing major research projects) the pen I reach for is the Cedar Blue 51 Vac with the nicely tuned EF nib.
Ruth Morrisson aka inkstainedruth
Yeah, I'm a long term fan of the aeromatics - such reliability, great pens.
I'd fancied a 51 Vac and was on the verge of buying a Wing Sung Vac copy - but, decided to stick with the original and managed to pick this one up for under £30. Looking forward to getting it apart and fixing it up - well, kind of looking forward to it, always slightly nervous discovering how a new (to me) system works.