High Relief Saints are up there but I’d say my overall favorite is a commemorative - the $50 Pan-Pac Octagonal. Not that I will ever own one, though. I’m also very fond of the 1794 Wreath cent.
Can't say I have a favorite but for a modern coin I always loved the obverse of the Mercury dime. So clean and artistic. As for reverses, I love the type 1 smaller eagle reverse seen on the 1807 and 08 CBH. The depiction really shows a bird of prey in my opinion. Not sure if I know how to post a pic either but I will try.
I may never own one but I love the octagonal assayer slugs. I love the crudeness and the geometric pattern on the back. In terms of big gold this is the closest I got
I'm not sure if I have a consistent favorite. The Buffalo nickel would be my favorite today because of its artistry and its very American subject matter. For sheer artistry in the classical numismatic sense the Saint and the Walker, in that order.
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Edit: Apparently I don't know how to post images either.
Large, octagonal, dolphins, owls, pine cones, Minerva gold!
The owl and pine coins are awesome.
So far as more modern coins are concerned, it's hard to beat this.
Walkers would be a close second.