Sorry Gordon but I have been working on various airworthy Allison, Armstrong Siddeley, Bristol, deH, Pratt, Rolls, Walter, Warner, Wright etc engines since 1962 and your description is still meaningless to me.
Props have hubs,
Engines have reduction gearboxes which in turn have prop shafts.
The prop hub is mounted on the prop shaft.
Therefore it now sounds like you were after the prop serial which is stamped in the prop hub and that is what RRHT supplied.
I am very pleased that the RRHT was able to solve your problem.