Longines ID

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Hi, this is my first post here and i'm no watch expert but do have mechanical skills and hoping to make these slight repairs.
I've attached a photo of the watch for ID purposes. I opened the back case and found stamping CLL0334 is that the model number? There is a lighter stamping that begins with M and followed by 4 digits, serial #, maybe?
The watch was acquired around the mid 1980's.
I am looking for help with the link pins/screws. If you look closely at photo you can notice that a screw end is missing from one of the links and that another screw and barrel also needs replacing. Are these parts avail? I took it to a jeweler for repair once before and he just put in some type of generic pin and peened it. Is that the best way to proceed at this time I can just as well do that also if I could get the pin but finding the proper parts would make it cleaner and easier. Thanks for any help