English 7,9x57 cartridge with headstamp P.H

I am slightly confuse with headstamp P.H
Please, help me to identify who was the manufacturer of this Inspector’s Dummy:
Parker Hale, Birmingham, UK
Raleigh Cycle Co., Nottingham, UK?

That is a 7,92 inspection round made by Parker Hale.
See P. Labbett, Development in Britain of .30, 7,92 and 15MM Besa, page 33


Parker Hale also made a very much rarer 15mm dummy round for the BESA as well as many .30-06 drill rounds (leaving the original American headstamp intact)

This board is at the Birmingham Proof House.


Thank you very much!