I don't know which win 7 version came with my laptop

i have a lenovo G550 model 20023 device. i know it had a pre-installed version of windows 7 and it was erased however i don't know which version exactly of windows 7.. home perumium or proffessional .. 64bit or 32bit. and COA sticker is erased.
is there a way to find out what version of windows 7 came with my laptop ?
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My laptop came with a windows 7 pre-installed and it was removed, can i re-install it again (i mean my original one the one that came with my laptop) .. i tried to search for a solution for this problem and i found out that i can download an installtion media and use my product key to activate the windows however i can't reach my product key as the COA sticker is erased. Or i can install OEM windows 7 using the lenovo installtion media ,however i don't have it and they don't ship to my country. Do i have any other options or solutions for this problem ?

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