How can you tell designation? There is a "7" stamped on each barrel flat. Both bores mike at the muzzzle .715". I am suspicious that the barrels have been cut, 26 1/8", no front bead, but it appears as if it was specially ordered. The gun is again proffusely engraved with an engraved monogram on the trigger guard. This and the previous Alex R. Thomson came from Scotland in the 1940's.