How do you value old coins?

In the realm of cryptocurrency and finance, where digital assets dominate the landscape, the question of valuing old coins often arises with a unique intrigue. Could you elaborate on the methodology you employ to determine the worth of such coins? Do you consider their historical significance, rarity, or the potential for future appreciation? Moreover, how do you balance the traditional principles of valuation with the ever-changing dynamics of the crypto market? I'm particularly interested in understanding how you navigate this intersection between the tangible and the digital, as well as your perspective on the long-term viability of investing in old coins.