Open the cedar chest lid and remove all items from the chest.
Close the cedar chest lid and latch it if it has a latch to keep it closed.
Turn the cedar chest over so the bottom is facing up and the top is on the floor. If your cedar chest has a rounded lid, lay the cedar chest on one side with the bottom facing you.
Clean the bottom of the cedar chest with a microfiber cloth so you can see the production date that is stamped onto the bottom of the chest.
Read the serial number backwards from right to left and put it in date order. For example, if the number is 366270, the chest was manufactured on 07/26/63. If there are seven numbers in the serial number it notes the plant where the chest was produced. For example, 2553150 would be made on 05/31/55 at plant number two.