Unless I am misunderstanding the question, if it were struck on a dime planchet, it would be expected to weigh less than half as much as a quarter. 2.3 g.
If I recall it weights about 4grams but the Red Book mentioned a 1970 d quarter a little thinner then normal and a little lighter could be stuck on a 10 dime
There is no way that quarter you are showing is a 10 cent planchet. If it was struck on a 10cent planchet, it would be smaller and much of the copy on the edges would be missing due to the difference in size plus it would be distorted as it wouldn't be held by the collar when struck.
The error was that they cut the planchets out on dime stock material with quarter sized blanks. This made the blanks lighter. The way you can tell is that the strike will be a lot weaker and the weight a lot lighter.
Quote: Shown here is a 1970-D Washington quarter dollar struck on dime stock. It weighs 4.24 grams. While dime stock quarter dollars can be found in many years between 1965 and 1992, the 1970-D coin is by far the most common date-and-Mint combination.
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