If you look very closely inside the case back, I think you might find the number 15 inside a cartouche. Beside that number you will see a .625. If you divide 15 by 24 (pure gold), the result is .625. The decimal equivalent of 15 karat gold. I think your case is not gold plated over brass. It appears to be solid 15 karat gold. To the best of my knowledge, 15 karat alloy was only used in Germany and or the Scandinavian countries. Others may know better. If you were to luck out and find a good, complete parts movement, you could resuscitate this watch, and turn it into a useful timepiece that would be a joy to wear.
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