What is this Longines model

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Hey guys, looking to get my first vintage Longines but still learning all about these beautiful pieces of art.

So I found one that I really liked and looks great but I can't figure out what movement it is online, it seems to say 27 1. Can anyone help out as to whether the movement is legit and what is the ref number of this watch?

Thanks in advance guys!
 
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27 M

Reference will be marked inside the case back.