Hi.........Pictures say more but it reads like you have part of a set. In years past, fish was served more readily than it is today. It was served on a platter, dispensed on smaller plates as yours then smaller matching plates were used to hold the bones, etc. of said fish. And a delicacy it was I'm sure.......
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best............... ..Tim
"We didn't lose the game; we just ran out of time."
- Vince Lombardi