Fin search

I'm re-entering the surfing world after a 34 year absence. I just acquired a "Greek" "Maui Model" board with a broken fin (see photos). The board is rough but I'm hoping to replace the fin to make it useable. The fin is an early interchangeable system (not adjustable) and displays "W.A.V.E. SET" on the base. Does anyone have one of these they could part with or have any idea where I can obtain one? Any help would be appreciated. Thanks!