Your advertisement is from 1986 and it was sponsored by members of the Coalition for a Smoke Free City. Here is a link for you to a comparable that sold at an auction for $29.99: http://www.worthpoint.com/worthopedia/virginia-slime-smoke-free-ad-1986-458923607
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Thank you for letting me know that this past auction sale record is the one you had actually personally purchased. Are you planning to sell this or insure it?
Since there really are not any visible sold examples other than the one you own yourself that was purchased for $29.99 you could potentially ask what you please since you own it. The key factor being finding a willing buyer at your asking price. A fair asking price would be $100 - $200. You can also place this in a poster auction and see where the market takes this with bidding. I recommend Rennert's Poster Auctions in NYC: http://www.posterauction.com/
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