Can't tell you much specific information regarding the composition, mintage etc but it commemorates Oliver Hazard Perry and the Battle of Lake Erie in 1813.
This might help you out.Yours appears to be silver so pay special attention to the last two sentences.This could be worth something! http://www.nmm.ac.uk/collections/explore/object.cfm?ID=MEC2492
More info, Even though it appears to be silver,it it probably a restrike made after 1869.The originals had the engraver's name,Furst F., on both sides and yours only has it on the reverse.Here is where I learned about this. http://www.baxleystamps.com/litho/medal_ohp.shtml
