If it is one of the gold plated versions sold as a "collectable", these are still available from the manufacturer and only worth their retail price of $2 to $3 and only if it is still mint in the case and uncirculated. These were (and continue to be) manufactured by a third party vendor that simply takes quarters and electroplates them for resale.
If it is out of the case or damaged, it's worth twenty five cents plus whatever weight in gold you can scrape off and sell for scrap (generally a few cents worth). If it still looks good but is out of the case, its worth maybe $1 if you can find a buyer
If it is a solid gold coin, these are worth current market value of the gold in them. These were just stamped pieces of gold and intended to be used the same as a gold ingot, their value is the gold itself and not the coinage. This could easily be worth a few hundred (or more) depending on the type of gold used (14k, 18k, 24, etc) and the total weight (even minor differences in the carving or scratches can change the weight).
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Not much about 25 cents worth it's plated.
It's a novelty item worth couple of cents for the gold plating plus whatever the underlying quarter is worth. If the quarter is copper-nickel, then it's only worth a quarter. If it's a special silver "prestige" quarter made in San Francisco it's at least worth maybe $3.50 for its metal content.
It is only worth 25 cents and in no longer spendable.
The Philadelphia Mint hasn't produced silver coinage for circulation since 1964. A 2003-P state quarter is worth 25 cents.
The gold plating adds nothing to the value of 25 cents, unless you find someone that wants it, it's a quarter.