The I-551 stamp is a temporary indication that you have permanent residence. USCIS may have placed the stamp in your passport if you have been waiting for a permanent resident card to be issued. If you have any questions about the stamp or your immigration status, you should consult with an experienced immigration attorney.
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J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.
Yes, it is a temporary greencard .. until the plastic one arrives.
IMMIGRATION LAW PROFESSOR for 10 years -- LEGAL DISCLAIMER: This answer is offered for informational purposes only. It does not constitute an attorney-client relationship.