That redwood almost certainly is virgin redwood; very close-grained and very beautiful. Such wood has not been available for several years, to the best of my knowledge, because no virgin redwood trees are being cut any more. The mills that were built many years ago to handle the huge virgin redwood logs no longer exist.
Second growth redwood trees grow much faster that the virgin redwoods did because human foresters have made sure that second (and 3rd and 4th) growth redwoods get lots more light and air by keeping the spaces between trees much more open. Lumber from these trees has much wider grain spacing and no longer has the resistance to rot and fire that the virgin redwoods did.
Best regards, Hart Corbett