Old mole trap

Was wondering if anyone had info on an old mole trap i inherited back in the 80s name is ALVAU MOLE TRAP SEATTLE WA its on the cover of this book, the one on the right>>>>> https://sterlingfur.com/marsh-mole-traps-a-collectors-manual/ I dont have the book, was trying to figure out rarity and a ball park value, thanks in advance

I just now found the patent page, its an early 30s patent, interesting read

https://patents.google.com/patent/US1918582A/en

I usually see them sell in the $50 - $70 range. Depending on condition.

This one had all the wood components that sometimes rot or get powder post, steve albano of trapline traps traded me 2 dozen mole traps for it, we are both happy