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I was able to pick this off a flea market for the equivalent of 11 USD, and it writes great (though it took me all of one hour to rinse out the red, blue, green, and black ink residue on it).
It seems to be completely made of brushed stainless steel, even the cap band. There isn't any picture of it, but the cap jewel is black, and the barrel end also has a bit of a black jewel.
I do wonder when it's from, or if it's even real as all other Sonnets I've seen have the engraving around the cap, not on just one side. I was going to take a picture of the feed itself, but I forgot to until I inked it, and I don't really want to waste any of my precious Blue-Black Quink, of which only one bottle was available. Any thoughts on this?
edit: according to parkerpens.com, the Sonnet was only introduced in the mid-90's, therefore it doesn't really qualify as a vintage pen per se, but assuming it's a real one, and the quality seems to support that, then it's a rather old model.