Is that more or less than the spot price? I would have assumed that they trade higher, though maybe the non collectibles trade are only a little bit higher.
Also a very good question and the answer is also...it depends. The "premium" (delta to spot) on 90% silver (aka "90%") varies with supply and demand. At this very moment with the meteoric rise of base silver, 90% is selling for less than spot. But there have been times when it trades above spot.
The reason is that silver itself is traded on the various international commodity exchanges and those traders are not the same supply & demand sources as the little guy(s) who likes keeping some old silver coins in their garage. So as those supply/demand curves shift, the premium over/under spot price changes as well.
My experience, I sometimes buy gold coins to make jewelry. I do that because at least here in Belgium, there's no VAT on coins but there is VAT on the other forms of gold that are more commonly used for that. For professionals it's not a problem because they pass VAT but for an individual it's a 20% difference. Also I'm in Antwerp so it's really easy to just bike to a place that sells gold if I want to.
In my case I buy old French 20 francs coins as they are quite "cheap": 1% above spot price of their gold content (they are 90% gold).
Other more recent coins, like Chinese or Canadian ones, sell at a much higher premium (17%, 20%) so I always wonder a bit who they are for. It's unlikely they can be resold for that much of a premium. At least the shops I use just buy them for their price in gold.