The EASA Form 1 is the Authorised Release Certificate released by a POA holder for stating that a product, a part, or a component was manufactured in accordance with approved/not approved design data. [1]

NB: the same for is suitable for Maintenance Organization as well.

Instructions for the use of EASA Form 1 [2]

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1. PURPOSE AND USE 1.1. A primary purpose of the certificate is to declare the airworthiness of new aviation products, parts and appliances (‘the item(s)’). 1.2. Correlation must be established between the certificate and the item(s). The originator must retain a certificate in a form that allows verification of the original data. 1.3. The certificate is acceptable to many airworthiness authorities, but may be dependent on bilateral agreements and/or the policy of the airworthiness authority. 1.4. The certificate is not a delivery or shipping note. 1.5. Aircraft are not to be released using the certificate. 1.6. The certificate does not constitute approval to install the item on a particular aircraft, engine, or propeller but helps the end user determine its airworthiness approval status. 1.7. A mixture of production released and maintenance released items is not permitted on the same certificate. 1.8. A mixture of items certified in conformity with ‘approved data’ and to ‘non-approved data’ is not permitted on the same certificate

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  1. https://www.easa.europa.eu/faq/19466
  2. https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:02012R0748-20140217&from=EN