Birmingham makers R.P 1886 Help Pls

[hallmark hunter]

Really need your help on this one! The Birmingham makers is not 1810 as in a previous post. It's just that the shield is real funky so I'm now thinking its 1886.

Its a pocket watch called Farringdon C. The makers stamp is really clear, it says R.P in a circle. I have tried taking photos of the watch but the flash interferes badly with the image of the makers marks.

Any help would be greatly appreciated.

Thanks.

Hunter