brass instrument?

[Moe (fl)]

Any idea of what this was part of? It was found at the beach after a nor'easter.

HH.
Moe

 

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[wwwtimmcp]

looks like a pipe cap. probably sat on top of a water fill pipe to keep saltwater out of the drinking or steam boiler water.

 

[ivan salis]

glass "dail" type cover -- used on ships