Old JHS Contact Instrument Microphone

JHS Contact Instrument Mic? from the 70s and 80's JHS as it had a sticker on it years ago with the black and white JHS Logo, think it's a contact mic for acoustic instruments and/or guitars. It was a small metal Square leading off to an RCA cable ! Used to have a sticky base many moons ago, its really LoFi and a touch noisy! i did clean up one version a bit in RX as the hum was lovely although there is the version with the hum if that's your thing. Did a test sweep with a powered monitor! dirty nasty and cheap and old see what you think! Anyone have info on this would love to know when, where, why and what? but here are two versions of its sound!