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davidcyclebackThe Orbits are easy to authenticate, as they often have a silver patina or tarnish to the photo surfaces that changes in intensity as you change the angle of the suface to the light. This 'silvering' only happens with age and is a near sure sign a baseball photo or Orbit is vintage.
Below is a picture of a 1920s snapshot with Casey Stengel that has strong silvering in the dark areas of the image. If you change the angle of the photo, the silvering would get darker and lighter.

Luckily for card collectors, this authenticating silvering appears on other early 1900s real photo cards, including the T200s, Fatima Premiums and real photo postcards.
Last, the silvering appears in the very dark areas of the photo. So if your Orbit or other photo is underdeveloped or otherwise overly light, the silvering might not be noticeable.