Parker Hale M85 Serial Number Checks & Provenance on Manufacture (Records)

[desperatedan]

As an example my M82 has "BNP SP" on the barrel adjacent to "BNP 20T" on the receiver just above the serial no. I'll try and post a picture later if it helps. Of course the wording for the proof marks may differ over the years but I think "SP" has always been used to signify "Special Proof".
Regards Kev

Picture now added