Classic Commemoratives In Original Holder

How common? Not very. I never seen have seen one.
Premium? That is the $64,000 question.
Best thing to do is to learn the prices with the holder. Then use your judgement.
A few dollars extra would be ok.
Some collectors appreciate originality.

As I'm sure you've already figured out, the original holders are far more scarce than the coins themselves. For many of the coins, the number of surviving original paper holders is less than 100. There were several issues that used a black leatherette holder, the Cincinnati was one of them. These sturdier holders appear to have a better survival rate.

The Cincinnati holder comes in two versions. The first features a notarized certificate on the back; these holders were used for the first 200 PDS sets of Cincinnati half-dollars struck. The same black holder, but without the notarization, was used for distribution of subsequent sets. The Cincinnati holders are almost identical to the holders used for distribution of the Cleveland Exposition half-dollars; the distribution of both issues was handled by the same man â€" Thomas G. Melish.

I have written about these holders here on CCF, maybe the following links will be of interest: https://goccf.com/t/116786, https://goccf.com/t/116328 and https://goccf.com/t/128834.

Regarding pricing, you should expect to pay a premium of $100 at the lower end and up to $200-$400 for notarized Cincinnati holders in nice shape. Non-notarized holders often sell in the range of $75 to $150 depending on condition. You might be able to find them for less and you might find dealers asking for more, but those ranges should at least give you an idea of the current market. (One note, I've seen a recent rise in prices being paid for these holders so the prices quoted may be on the lower end of today's scale.)

Hope that helps!