Sorry you had to wait so long for a response. I've looked at this many times, but don't have enough information from the photos to make a call. The positioning of the mintmark appears correct for the VAM 4, but the 'O' is a different shape than that shown on VAMWorld ... look at the inside area of the 'O'. The VAM 4 is more round. Wear may diminish this, but yours appears more oval.
On the 1886-O look for mintmark doubling or clashing. These are the most desirable varieties of that date (VAMs 1A, 7, and 11A).
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