Hello,
The Drawing number RA.10046/RTS indicates the Rotol airscrews for Spitfire Mk.VII, VIII, IX powered with either the Merlin 61,63,64,66 engines and Seafire Mk.IA, IIA, III. The "RTS" marking indicates it's made of Rotol Jablo wood or Hydulignum with thin Rotoloid covering, and a simple brass sheath. The prop blade was made by the Hordern-Richmond Aircraft Company. The HR 56002 is the blade serial number used by the manufacturer. The yellow numbers on the front surface of the blade at its root indicate the four-blade prop blade no.4 serial number 67105. However the marking is not the standard one that can be found on most of the kind of prop blades. IMHO the yellow serial number is different from the one ( ? SER. NO. R6017) seen at the bottom of the proop blade. To sum up ... the Spitfire prop blade and for the Mk.IX in my opinion.