I'm not sure what's going on under this mintmark. It almost looks like a raised W (which seems odd for a clash from the recessed M that signified Morgan's initial). What is going on there?
No idea, die chips maybe? if you are looking for VAM http://ec2-13-58-222-16.us-east-2.compute.amazonaws.com/wiki/1879-O_VAMs I can't do too much with these close ups on this one. Maybe you can narrow it down withthe link and go by Reverses and Mintmark placements.
The die chip preceeding the B in PLURIBUS & after the E in ONE seem pretty distinctive, but I haven't found a match yet.