I have a Mercury Jet Unit Model G.
Manufacturer: Outboard Jets of San Leandro, California
Models Covered: Mercury 4 & 6 cylinder in-line motors, 65 to 150 HP, years 1965 - 1987
It came with my boat for my 85Hp Mercury Outboard but I use my prop drive and don't need it.
Selling for $250 Firm!