That’s a fantastic watch, and if it’s a model you’ve wanted for a while, I’d definitely restore it rather than let the missing parts put you off.
Indeed … if a grail with difficult to source parts the only place to send it is Longines. It’s gonna cost you though.
I’d probably avoid sending it straight to Longines before checking with a specialist who knows these vintage chronographs. The inner bezel may be the hardest part to source, and you’ll want someone who can confirm the correct original specification rather than fitting a generic replacement. For the case, light refinishing is worth considering, but I’d be very careful about over-polishing the edges. A good vintage Longines specialist should be able to source period-correct parts and overhaul the movement properly.
I was thinking a light refinishing would be nice too! Keeping the edges sharp and keeping the brushing tasteful and correct is the challenge. I would worry about Longines sticking a generic replacement part in - better to have an original with matching patina
