The only W Harvey I can find is as follows below
however some doubts were cast upon it because of its apparent date of manufacture about 1840...however the firm had been operational since 1820 ! I believe therefor putting this mark W HARVEY in range.
However... things never being so simple ...especially on this subject please see
http://americansocietyofarmscollecto...2_Darling1.pdf
Where there is a sword with the stamp W HARVEY ...used 60 years before W Harvey came to be as a sword maker ...with his mark on the blade... very odd.
However are we looking at a rehilted later blade ?