There I read this coin is worth $20 and up. Is that a fair valuation? Then it was stated that a no mint mark or weak mint mark carries some serious worth. This raised a few questions to me: I thought any coin sans mint mark came from Philly. How can you determine if it’s a coin from Denver? How would it be distinguishable from a standard no mint Mark Philadelphia coin? The lack of the smell of a grilled steak, onions and cheese sandwich? ‘And what determines a weak mint mark? This one looks ok to me but feel free to disagree.