1884 O Morgan-What Possible VAM?

Double clash. Not particularly rare - some problems that will cause a planchet to fail to feed are repetitive, allowing the dies to come together more than once - and not sufficient to warrant a VAM designation on its' own. Which means, unfortunately, you're stuck attributing this coin by its' other features.

That will be difficult. This is still a very incomplete science - most people don't recognize the staggering amount of information yet to be gathered about even the identified VAM's - it's not like there's a system in place of microscopic examination of each VAM with subsequent publication of all information gleaned.

It's frustrating.