Found this coil with a bunch of other New equipment during an estate sale. This is brand new in a box and has never been used. Below is what I found on the internet for the model of this coil
Fisher 15" DD Round Open Waterproof Coil.
This coil delivers excellent depth, durability, and target separation.
Compatible with the Fisher F70, F75, F75SE and F75LTD Metal Detectors.
The 15” DD Coil gives you a huge depth advantage over the 11” Coil, especially when used with the boost or cache modes.
This coil delivers excellent depth and target separation!
Compatible with the Fisher F70, F75, F75SE and F75LTD Metal Detectors
Durability and high performance from the original equipment manufacturer
A great addition to your Fisher detector, helping you find more treasure more often