I am thinking of buying a 60's Hamilton chronograph (Landeron cal. 248) for about $500. But before I pull the trigger, I am wondering what other options exist for this amount of money in vintage chronos. I have a soft spot for Hamiltons, since I own two very old Hammy railroad pocketwatches though I'd love an old Heuer or Omega Speedmaster. But I think these latter ones are going to be at least twice what I can afford. Any other marques I should consider or places to look in my price range? I'd prefer late 60's/early 70's.