mining ordnance survey maps-originals of various south wales mines early 1900s ?

offers invited for rare opportunity to own original engineering underground ordnance survey map of a south wales mine. I have searched everywhere and these seem to be the only originals for sale in wales. i have a number of different mines spanning early 1900s offers are invited PER MAP if you let me know details if a specific colliery is required. all maps are on parchment and very rare. also available rare world war 1 1907 enfield baynouet stamped with makers mark, issue number etc. cover is also included . pictures can be sent of any items upon request tel 07578628993