Thanks again to Dale.
A (nearly) matched pair of takedowns. The upper is a 1910 9.5x56 (375 Exp) and the lower is a 1903 6.5x54.
Both have pop-up tang sights and British proofs though no indication of British maker's mark. The 375 is all original but some yahoo in the past cut the stock on the 1903 and then added a spacer.

Hope I'm now forgiven for polluting this thread with pics of a 6.5x53R.

SOS