Dear Ms. Cerrone,
Thank you for posting your request on History Hub!
As you read in a previous post, the National Archives will not have a copy of the certificate of citizenship. However, a copy of the Certificate of Naturalization may be filed in a Certificate File (C-File) maintained by the US Citizenship and Immigration Services (USCIS) Genealogy Program. Some C-Files still exist in original paper format at USCIS, but there are many that were microfilmed and the originals were not kept. Due to this, it is difficult to say what the quality of image that USCIS can provide will be - some of the microfilm images are unfortunately low quality.
Since you already have Agostino Mercurio’s C-File number, we suggest that you place a request through the USCIS Genealogy Program. USCIS will not be able to issue a “newly printed” replacement of the original certificate, but only copies of the original documents.
We hope this is helpful. Best of luck with your family research!
[Information provided by Elizabeth Burnes, Subject Matter Expert]