​A sea-circuit board found washed up on a beach in Okinawa. About 8-9cm across at its widest.

Found this bit of circuit board washed up on the beach on the east coast of Okinawa, the southernmost Japanese island. No other similar bits about, just a lot of coral.

Looks like it’s been in there a while. White circuit markings still visible though.

Any ideas what this could have been a part of?

submitted by /u/ballyfast
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