Wow. Very cool. Good job on getting the ID.
Look at the amazing example of this coin in my picture. It is in gorgeous condition. All the other examples in the database I use are far inferior in condition. Your coin looks extra bad due to the giant scratches.
The coin in my picture sold for $3600 US dollars in a recent auction. Yours would probably sell for about $100. The coin in my second picture (one side only) sold for $199.
CoinQuest thanks Heritage for use of their coin photo. (When CoinQuest was just starting out, back in 2009, Heritage was one of the few big-time dealers that granted copyright release to us on their coin images. It was one of the major factors that let us become a successful coin web site.)
Here is the complete auction description for the $3600 coin. Note that it is a 2 ducaton coin, weighing a massive 63 grams.
Heritage World Coin Auctions > ANA Signature Sale 3094 Auction date: 19 August 2021
Lot number: 35150
Price realized: 3,600 USD (Approx. 3,081 EUR / 2,635 GBP / 3,305 CHF)
Brabant. Philip IV 2 Ducaton 1648 AU50 NGC, Antwerp mint, KM75.1, Dav-4453. 63.27gm. A bold Double Ducaton that preserves full device outlines against only modest highpoint circulation wear. A balanced battleship-gray patina overlies features displaying remnants of luster, while deeper graphite tone graces the periphery within the outer ring.
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Estimate: 3000-4000 USD