The D = 65/18.7 is chamber dimensions. Chamber was 65 mm long with a diameter just ahead of the rim seat of 18.7 mm.
The P 1K238.6 was weight of the barrels only as proofed.
If those digital scales can be switched to metric you can check to see if they still weigh that or at least very close. If the bores have been honed extensively or otherwise enlarged they will weigh light. If the scales don't convert you will have to convert the kilograms to lbs.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra