Somewhere around 1990 the mint started standardizing the mint marks and began punching them into the hubs. Before then, the mint marks were hand stamped into the individual dies, so they could be anywhere from up in the date to down by Lincoln's lapel on cents.
The coin you have is in a location deemed acceptable by the US Mint at the time. As stated before, 1989 was the last year that the mint marks were punched into the dies, after that it became part of the master die for the mint location it was at. Therefore 1989 is the last year for RPM and OMM varieties. As far as to your original question, there would be no addition value on a mint mark in the location your coin shows. Look at it closely to see if it may be a RPM. Use the coppercoin website to help you determine which one if it is a RPM.
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