Thank you for the correct terminology! I am sorry, sounds like you cannot see my photos. The flats show the letters TP above a semi circular St Etienne. This semi circular St Etienne is upside down to all other markings on the flats, and is faint. All of this is just to the left of the mid line, close to the barrels, reading with the breech inferiorly. Right and left sides of the flat is marked with the crown above PT . 65 is stamped on each side of the PT marking, oriented at 90 degrees to the PT stamp ( ie longitudinally)

On the right barrel, just superior to the flats, is the serial number 10405
Closer to the flats than the serial number, the crossed palms below the crown and Ste. Etienne followed by 18.2 are stamped on each barrel.
longitudinally on each barrel. Medically to the left barrel stamp is the marking M*M

Hope this is helpful, and not more confusing!