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It's a DT Swiss G540, which is 24mm internal (https://www.lfgss.com/comments/17411022/)
Measures 37.3mm with my verniers at an unknown pressure.
I've also got 38C (40mm) Terreno Dry on a set of G540 that I bought from @M4xime yesterday and since my verniers are out, they come up at 41.4mm
It looks like the widest part on both of these tyres is the sidewall, rather than the side knobs, so whether or not they will fit a bike will depend on exactly where the tyre clearance flats/bends are. I'd probably stick with 35mm on the Mason Resolution and only in dry weather.
The Sendero 650x47s come up just over 47mm on MasonxHunt rims.
https://www.reddit.com/r/randonneuring/comments/11qdaje/recommendations_for_fast_wide_3538mm_tyres/
Anyone got a 38mm GK slick they want rid of? Would be interested to test this in the Mason
https://www.panaracer.co.uk/products/panaracer-gravelking-slick-tlc-folding-tyre-1
Crux rear wheel on the Mason. 38mm Pathfinders.
Won't work (too close to chainstay and FD) but I reckon a 38mm slick might actually just fit using these wheels.