You should be more concerned with the weight and diameter then the thickness. A St Gaudens $20 a.k.a. "double eagle" should weigh 33.40 grams and have a diameter of 34.00 mm. Hope this helps
I think the thickness is supposed to be around 2 mm so your 2.5 is half a mm off. The exact weight should be 33.436 grams(1.075 troy ounces)with a diameter of 34 millimeters
This is a tough call without pictures. The thickness of 2.5mm, if measured at the rim, is close. The fields are where the thickness should be closer to 2.00mm. Can you post a pic? The weight and diameter being correct is a very good sign.
You have a genuine coin. There should be edge lettering and stars on the rim too. It looks to be a high AU or low MS piece that I would value around $1500USD.
I obtained an MS60 1924s Double Eagle many years ago when the gold price was around $350. I really had no reason for buying it at the time, except that I have always liked the design. I am still very pleased with it. I normally collect ancients.
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