I purchased this 20 years ago at an estate sale and was going to hang it on the wall but it's just been in storage. They said it was a board from a cargo ship the Grosser Kurfurst that was commissioned in 1899. Very old hardware and board. On the front is written (Gepack  fur Eildert Rand mit Dumpfer Grosser Kurfurst)  it measures 39.5"L x 8"H.  Thanks for looking!