Recs translations?`

<p>Okay so I'm supposed to get the headmaster at my school to write me a rec and send it to the school for a scholarship, and I'm pretty sure he's getting an english professor translate the rec in english. But is he supposed to put a stamp on it since the stamp is not in english, and if he is supposed to put a stamp on it, then is this document supposed to be translated by a certified translator since its already in english except for the stamp? Or is it okay if he just signs it without stamping the school seal on the document?</p>