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The old saying goes that over 90% of a vintage watch value comes from the dial condition. Patina is fine when even and not too intrusive, but personally I find the damage to dial around 9 o'clock with the overall tone of the patina not the most desireable on this one. So I would say maybe $800.
Thank u for your comment and I'm quite happy with your appraisal. I got it for $480. On the other hand, i got a Cal 551 almost the same time,... the crystal is not original, the crown is a Speedmaster crown n stem. so I got change the tube n according to the owner the watch is sleeping there for 6 yrs. So, today I went to a shop selling vintage Omega watches to change the original, crystal, crown, stem, tube n overhaul the watch, total cost $450. So its even.