Sure is beautifully filled. I refinished a friend's Belgium Browning '06 like that, using True Oil. 56 coats, sanding down to wood with 1,500grit wet/dry every 4 thin coats. Then 4 final thin coats and polish with rouge in oil. Beautiful - like a mirror - no the waves like WTBY puts in their epoxy finishes.
That is nicely done, as one might expect.