What was Oysters Gresham?

Just had dinner at Broussard’s. They have, in the hall, a menu from long ago, on which appeared “Oysters Gresham”. (I’ve seen it nowhere else). Anyone know what “Oysters Gresham” was?

Paging @LouisianaMouth and @CiaoBob

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It was mentioned as a specialty in Fodor guidebooks in 1990. No more information, though.