The Eterna Sevenday Fastbeat has been my first vintage watch, and a NOS to boot. I suppose it gets much less wrist time than it deserves but it is such a charming piece every time I put it on. Reminds me of the funkiness of the era in which it was born and is in many ways more playful than what the 'serious' brands would allow themselves these days.
So what has been your gateway drug into the vintage world? Or what is it likely to be, in case you are still to enter?