How about Lunars? I noticed that Lunar Series 1 silver coins command significant premium...
They are sold with that premium
right now. In the future, nobody knows. Aside from having spot value as a near certainty, their value could be a bit higher, a lot higher, or a whole lot higher. Nobody knows.
Obviously, the mint that makes them and the bullion sites that sell them want you to think they will go up in premium value. There is a ton of marketing on them with press releases, ads, forums... limited mintage, special edition, bla bla. You need to realize that the marketing is where much of the perceived premium value stems from. I have seen many accounts here on this site that are simply to spam "collector" coins. Bullion sites and mints will always be happiest to sell their high premium coins, esp the current new ones or any they didn't sell in past years, for obvious reasons. Likewise, most people won't sell a premium coin they just bought for a loss, so the supply is somewhat constricted in the near term. However, once that marketing and hype basically disappears once the set is over, and
the market will decide the value from that point forward. Think of the current minted sets that carry a premium like IPOs on stocks (IPO usually stands for "it's probably overpriced").
As was mentioned by milled, it is all speculative with regards to what premiums for any coins or rounds will be in the future... and if premiums will continue to exist. You are basically guessing on the subjective value of the coin art to future buyers, many of whom haven't even been born yet. A lot of perception of current coin sets (Lunar, Queen Beast, Amer the Beautiful, etc etc) will depend on what sets come out in the future and if they're perceived as better or worse in terms of looks and potential for appreciation. Silver tarnishes, spots, tones, etc even if it is in capsules, so newer coins almost always tend to look better.
My guess is simply that the coin market will always remain full of many many current silver mintages and past minted choices, and most people will buy whatever they like that is around spot price. Some people will fall into the marketing from the mints and chase sets that have a premium. Newer collectors also often make the mistake of overpaying for high premium or fractional or etc types of silver, but the newbies arent usually aren't buying in much quantity. In the end, people can put whatever price tag they want on prior minted sets and coins, but if the price premiums are higher than buyers will pay, they will just sit unsold.
I honestly don't even know what lunars are, but I'm sure it's a collector series of 999 coins just like Queen Beasts or Canadian Maple privy or many others. It has the current benefit of promotion and pricing support from the bullion sites and recent buyers. When the bullion sites move on to new cash cows and the buyers of them lose patience and want to free up cash for other things, you will start to see if the premium is still supported.
In reality, you see most older silver coins and rounds selling for right around spot, so that's always the default future value in my estimation. Therefore, I won't play the high premiums game. My guess for the Lunars in 5 or 10 or 100 years would be spot price +5% or 15%, just like govt bullion and most past sets that have ever been done. I might pay slightly more towards the 10-15% side for good art or good condition, but that's about the limit on the vast majority of my stack. Silver is silver, with very few exceptions.
The only exception is the super high premium art stuff like the God of War barsenault mentioned. That is more of a collectible art than a coin, though. It might as well be made of pewter or aluminum or or glazed clay or anything... its silver is merely the medium for art (and a marketing factor to sell it). That art stuff is a totally different animal. You are getting into the realm or rare collectibles, which can appreciate based on sentiment and aesthetics and rarity. Spot prices will barely have an effect on those.
