For individuals aiming to secure Portuguese nationality based on birth in Goa before 19 December 1961, a distinct set of documents is paramount:

1. Applicant’s Birth Certificate or Birth Teor, which is vital for those seeking a Portuguese passport. 
2. Identification Document – This can be the Indian Passport, complemented by either an Aadhaar Card, Election Card, or Driving License. It’s essential that these details correspond with the Birth Certificate. 
3. Death Certificate, if the applicant has passed away. Birth Certificate/Birth Teor and Marriage 
4. Certificate/Marriage Teor of the applicant’s parents, crucial for verification in Portugal. 
5. A Residence Certificate detailing the current residence and the duration of stay from 1 January 1974 to 31 December 1975. (Specific formats will be provided upon the submission of the aforementioned documents). 

After collating and presenting all necessary documents to the Conservatoria dos Registos Centrais in Lisbon, Portugal, the Portuguese Nationality/Birth Registration process generally takes about 2 – 3 years. This timeline hinges on the successful verification of the Birth and Marriage Teor/Certificate of both the applicant and their parents by the pertinent Portuguese authorities.

It’s vital to note that the internal document verification process, orchestrated between the Portuguese and Indian Government authorities, is confidential. Estimating a precise completion date can be intricate due to unforeseen elements like internal document assessments, the necessity for additional documents, or alterations in policies or laws in either Portugal or India. Such variables are unforeseeable and beyond our control.

For Goans looking to obtain Portuguese nationality by registering their marriage in Portugal, a specific set of documents is essential:

1. Assento de Nascimento (Photocopy): This is the birth certificate the Conservatoria dos Registos Centrais issued in Lisbon, Portugal. It’s crucial to understand that this certificate can only be acquired after completing Stage 1, which involves the registration of birth in the Conservatoria de Registos Centrais.
2. Applicant’s Marriage Certificate: A certified copy of the marriage certificate is necessary for those applying for a Portuguese passport.
3. Spouse’s Birth Certificate: A verified copy of the spouse’s birth certificate is crucial for verification in Portugal.
4. Identification Documents: The spouse’s Indian Passport, supplemented by an Aadhaar Card. It’s vital that the details on these identification documents match those on the birth certificate.
5. Spouse’s Death Certificate: This is only required if the spouse has passed away.

After gathering and submitting all the required documents to the Conservatoria, do Registo Civil in Lisbon, Portugal, the Marriage Registration Process typically spans 3 to 4 months. This duration depends on the successful verification of the spouse’s Birth/Marriage certificate.

It’s significant to mention that the internal verification process, carried out between the Portuguese and Indian Government authorities, remains confidential. Due to various factors, such as internal document verification, potential additional document requests, or shifts in policies or laws in either Portugal or India, the exact completion date remains uncertain. These factors, beyond our control, can affect the process’s length.

Required Documents:

1. Assento de Nascimento and Assento de Casamento Copies: These are pivotal records for those seeking Portuguese nationality. The Assento de Nascimento is the birth certificate, and the Assento de Casamento is the marriage certificate. Both are issued in Lisbon, Portugal – the former by the Conservatoria dos Registos Centrais and the latter by the Conservatoria do Registo Civil. These certificates are accessible after the successful registration of a parent’s birth and marriage in Portugal. 
2. Applicant’s Birth Certificate: This document is essential for those pursuing a Portuguese passport, as it verifies the applicant’s date and place of birth. 
3. Identification Documents: A valid Indian Passport is necessary, supplemented by an Aadhaar Card. It’s crucial that these details align with the Birth Certificate for proper verification in Portugal. 

The entire Birth Registration Process in Portugal typically takes 8 – 10 months from the time your documents are presented to the Conservatoria dos Registos Centrais in Lisbon. This duration hinges on the successful verification of the applicant’s Birth Certificate by the relevant Portuguese authorities. 

It’s vital to understand that the document verification process, orchestrated between Portuguese and Indian Government authorities, remains confidential. Estimating an exact completion date can be intricate due to unforeseen elements like internal document assessments, the necessity for additional documents, or alterations in Portuguese or Indian policies and laws. Such variables are unforeseeable and beyond our control.