To get current values, you might want to use eBay Sold items. https://www.ebay.com/sch/i.html?_fr...n+cent&_sacat=0&rt=nc&LH_Sold=1&LH_Complete=1
If there's no mint mark it means it was minted in Philadelphia! Most wheat cents have very little added value unless they are considered key or semi-key dates. Even then condition is important. Here is a link that shows those dates. http://www.lincolncentresource.com/keydates.html You also might want to invest in a Yeoman's Red Book for some general guidance for pricing. Edited to correct spelling
