Finally managed to get my hands on a beautiful Parker 51 fountain pen!
It seems to be quite an odd Aerometric MK I model with a cap that might or not belong to this very pen. The cap has the Parker inscription over the clip (like the Vacumatics) but no diamond. It also says its was Made in Canada. The barrel or section don't have any inscriptions at all, while the filler mechanism says Made in USA.
It's got what appears to be a medium nib that is super smooth and quite wet and a body that looks terrific after a mild polishing. The cap has small dents but nothing easily noticeable. I paid a mere $45 for it so I guess I didn't do that bad.
Here's the pen, what do you think of it?