Glass Fish Net Float -approx. 10In Dia - stamped with Back to back Fs-Hokuyo ?

Description

1 Greenish to blue 10 Inch Glass fish net float with netting  ---  float has a round opening approximately 1 In. in diameter at the top, it is somewhat jagged  --- Stamped with Back To Back  F s  ---  See pics  ---  What I know of it is that it was brought home in the early 50s by a at that time a US Navy Sailor and has sat in the entryway ever since     ---  Thank You