HELP need info On this vintage tug boat license. (Olympia)

This was in some of my dad's antique items and if there's an expert on logging or tug boat operating in the Pacific Northwest from the 20s on up to the 70s, any information on these plates that were put on tugboats would be so helpful.
Or if you.
Want to make an offer on it.
Please send your phone number.
As it is difficult for me to message back-and-forth.
Thank you for your time and any information you might have for me.