A Furuno FE-450 depth sounder, rectangular in shape, housed in a grey plastic casing with a viewing screen and a set of four control knobs on the right panel. The faceplate displays the Furuno logo and has a yellowed control panel with various function dials for sensitivity, range, and gain.
The identification label on the side reads:
DEPTH SOUNDER MODEL FE-450
S/N: 8450-3011
FR.EQ: 200 KHz
POWER: 12 VDC
FURUNO ELECTRIC CO. LTD., NISHINOMIYA JAPAN
This model would have displayed sonar echoes on a moving paper chart or screen, allowing the operator to determine water depth and locate underwater features or fish schools.