[wrndln]

1930-Pickup,
The picture in Mack Hil's booklet doesn't say what year the bed was, but did said it was an "original" bed. The pickup bed floor wood kit I bought on eBay had grooves on both sides. In addition, the wood was marked "TOP" on each piece where the metal stripes would cover up the markings. Some of the undersides were not quite as nice as the side marked top, which tends to support SeaSlugs posting. Just guessing, I suspect sometime in the last 87 years the wood floor in your bed was replaced. I think it would look pretty rough if it were the original, as pickup's weren't treated very nicely (garaged) through the years. They were used hard and left mostly outside.
Rusty Nelson