This is grade B white oak with the circle saw marks left in the face instead of milled away. The arcing cuts came from the mill blade that first sawed the board, and they are the whole point of the floor. Special order, supplied unfinished, two to three weeks.
What the Saw Marks Are
Before band mills took over, boards were cut on large circular blades. Every pass left a shallow arc across the face. On new flooring those marks get planed off. Here they stay.
The result is a surface with shallow relief rather than a flat plane. It is the most textured floor we supply and the one that reads oldest in a room.

