Okay, I've found the fine print in last year's Blue Book (26th Ed.) that lists the Custom Shop guns with sideplates. For instance, an F1 is $44,165. The gun you posted the link for is a Midas F2 and I don't see it mentioned.
The paragraph on the sideplated guns is immediately followed by the statement:
"Grade I Traditional, Pigeon Grade, Pointer Grade, Diana Grade and Midas Grade Superposed are listed separately."
The Midas D Grade is then listed with a suggested factory price of $25,082 and a 100% condition price of $20,000.
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No wonder I'm confused...
"Browning, in 1985, resumed production of the Superposed in Pigeon, Pointer, Diana and Midas grades."
"In 2000, Browning changed the nomenclature of their B-25 shotgun Series."
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The earlier section in the Browning listing has a 12 ga. Midas Grade Superposed listed at $8,000 in 100% condition.
John