Should be fine although there are some caveats. If you are using a tin-lined copper pan, be aware that tin melts at 450 degrees Fahrenheit, so you will want to keep your temperature between 400-425 maximum.
If you are using a stainless steel lined copper pan, these can take more heat. How much? I don't know, maybe 500-550 degrees.
If you have any doubts, please contact the pan manufacturer directly.
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https://food52.com/shop/products/1924-vintage-copper-english-round-gratin-pie-plate-late-19th-century
This item has been lined with brand new tin, so it's totally food safe and ready to cook in!
All best,
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If you are using a stainless steel lined copper pan, these can take more heat. How much? I don't know, maybe 500-550 degrees.
If you have any doubts, please contact the pan manufacturer directly.
Best of luck.