Oh yea, I forgot-information. The crossed lightning bolt 'thingies indicate the gun was proofed in a finished state (completed). Not sure why this is marked on French guns, but, it is. The three crossed palm leaves indicate triple proof at the St. Etienne proof house. French triple proof is as high a level of proof as proof goes in Europe. 18.2 is 12 gauge expressed in metric. The left barrel is choked pretty tight, and they don't want you running pumpkin ball type slugs through it. The letters PT indicate proof with smokeless powder T, pretty much the standard French smokeless powder since 1900.
Tell your friend I said to use the gun in good health.
Best,
Ted