I have been honing in on a 1950s Bulova 23 as my first foray into vintage automatics. Seems they are quite common, making them easier to service and to comparison shop on eBay.
As I noted in another thread, I see a wide variety of quality at the same price points, from fully serviced watches with spotless movement pics to absolute clunkers with burry dial pics, no movement pics, and no information other than "it runs."
My strategy is to aim somewhere in the middle... find a watch with good pics, a movement shot, a statement that it runs properly, but no recent servicing. Then buy it for a bargain, take it to a watchmaker for evaluation, and hope it doesn't need a $200 service.
I've watched this particular one go unsold at $59 and get relisted at $35:
Vintage Bulova 23 Jewels 10BPAC 6 Adj Mens Watch Selfwinding 3 Day Auction | eBay
The seller says it "works good since I have wound it" and provides a movement shot. Here's where I need some help. To my untrained eye, the movement looks quite good for a 60 y.o. watch, but I do see green marks on the interior of the case -- not on the movement itself. Is this a red flag or just something that can be easily cleaned?