First of all, PA law is silent on open carry, so citations are going to be a little hard to come by, but yes, OC is legal in PA.
This site: handgunlaw which I have learned is kept up to date and is very reliable, shows reciprocity between PA and WV... http://www.handgunlaw.us/states/pennsylvania.pdf
Philadelphia is not very friendly toward OC, but the rest of the state generally is. You just want to keep in mind that the way OS is treated tends to vary slightly from cop to cop, and municipality to municipality. We are continuing to work on this.
When you mention reciprocity I assume you have a license/permit from WV? Or perhaps a non-res permit from another state? If so, and your permit comes from a state with reciprocity with PA, then you may also carry concealed, and you may also transport/carry in a vehicle with said permit.
Without a PA License To Carry Firearms, the only thing you cannot do (that I can think of at the moment) is carry OC or CC within the 1000' Federal Gun Free School Zone.
Welcome to PA and enjoy your stay!
ETA: For what it's worth, I have been OCing everywhere I go for the past 2 1/2 years, and I have yet to have a negative encounter. Mostly York County, which is straight north of Baltimore.
Final afterthought: I just saw you post in another thread that you did not have a CC permit. This limits you to transporting a firearm in PA to only certain specific places and back home again, such as: the range, hunting, gunsmith, gun shop, gun show, between residences, like that. In PA, you may not legally transport your firearm just for the purposes of OC.