Circuit boards are sometimes "potted" in silicone rubber or epoxy resin. Usually done to protect sensitive circuitry from moisture or to thoroughly insulate high voltages. If the resin is opaque it may be done to obfuscate reverse engineering attempts
Prop ID: 7777
Width: 15 cm
Height: 10 cm
Depth: 5 cm
Age: 1970s-1980s
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