The gun does not appear to be a Parker.
6.5 would be the Ferlach proof mark for a 65 mm chamber
65 was used by the Belgian proof house (after 1892)
British chamber length would of course be in inches, until post-1989 and then metric.
Chamber length can be modified over the life of a gun, and the standard turn-of-the-century U.S. 10g shell was 2 7/8" (after firing).
There is an easy way to measure chamber length using a 3" x 5" index card, rolled lengthwise, and slid into the chamber. It will partially unroll and expand to the chamber diameter.
Gently advance the card until it stops at the end of the chamber (where the forcing cone constriction starts), use a pencil to mark the card at the breech end of the barrel, and repeat the steps to see if it always comes to same spot.
Then use a ruler to measure the length marked on the card.
The chamber must be clean, and it works best with a new 3” X 5” card.
Let us know what you find.
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