Cool - I have some of those from the 1960's that my folks got for free when they were changing out to the foam/plastic floats. This was down at the Tacoma commecial fishing fleet area by Johnny's dock (when it used to be down on the Port of Tacoma). So I doubt they made too many more after that, but I'm sure people kept using them. Tribes probably longer since they seem to go with what they have rather than what the latest gear is. Junk turns into treasure with time...