Vintage Lumber Grading Stick /Ruler or Measuring Stick

You are bidding on this vintage oak Lumber Grading stick. It measure up to a 30" log. I can understand what is going on with the 1- 30", but it has numbers on all four sides of the stick, like to measure how much you would get out of a certain size board.(Thickness). There is a small split in it down where the metal tip will not let it split anymore. Very little split. The numbers on all four sides are very ledgable ,yet. There is NO maker on this stick, but seems like very organized and not something roughly made. Thanks for looking.