Longines Movement trying to identify the caliber

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Hi, I am trying to find out what caliber this movement is so I can buy some parts for it, it is about 26mm diameter, I can not find a marking near the balance bridge or anywhere else so I hope someone recognizes it, thank you. Is it a 12.68z?
 
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A watch material supplier should be able to identify it by the movement serial number. Which part do you need?
 
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A watch material supplier should be able to identify it by the movement serial number. Which part do you need?
I am told I need a new hairspring but I think I may have to buy a complete balance as well.
 
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Balance complete. Could be tough to find!