I've never seen end grain used up here. The only wood flooring that exists in old buildings is most always hard maple, and it's not tung and grooved, just laid edge to edge, usually no wider than 2". Also, some old buildings just had planed spruce flooring, which was painted. I can remember being in old homes when I was a kid, and some of the early flooring before vinyl would be warn through to the original spruce or maple floors. Why someone would want to put that crap on a nice maple floor is beyond comprehension.