Berg Larsen straightbill mouthpiece.

Hi, I waslooking at the Museum Section and noticed a Bronze Alto Straightbill 95/1 SMS Mouthpiece, it has an F stamp between the London England and Reg/ Design stamps on the shank. I have a Tenor straightbill s.s. 100/0 SMS with the same F stamp in the same place. Could anyone tell me what this stamp is for please. My piece is also 1990's. I have  tried all the other sax forum's without any luck. Hoping you can help.

                                                                          Regards Rob.   

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