1887? Great Britain Nw Government Parcel Stamp Help Please

Hello, Can someone identify the Scott number for this stamp and what the NW stands for. I can't find this overprint in the 2009 Scott.
Thank you
david

I am not 100% sure but I believe the NW Parcel Office was a parcel-handling office of the Royal Mail in Northwest London (the only city I am aware of that had different postmarks for different postal offices).

There are two stamps with that design, Queen Victoria Jubilee 4d 1887-92(Scott 116), and King Edward VII (Jubilee style) 4d (Scott 133). My guess would be QV Scott 116 as the KEVII stamp had a larger white margin around the green central design.

Edit: If QV, I wouldn't expect one to sell for more than $4, if KEVII would expect it to go for more than $9.

Thanks smauggie, I certainly appreciate your help.
David

Is the N.W. Parcel Office an overprint or part of the cancellation or applied by the N.W. london Post Office? I see Gov't Parcels stamps listed in the Officials but not this one. Would this be a different stamp from the ones overprinted Gov't Parcels?

This is a rubber parcel cancellation. Overprints are horizontal and say something like "GOVT PARCELS".

The clue is the two concentric circles which is the hallmark of the parcel cancellation.

Thanks again smauggie, that clarifies it for me.
David