Its a great find. I have a big soft spot for the early flightmaster, 145.013
I think the level of restoration depends on what you / your father want the watch to look like. Do you intend to wear it regularly and as such it should be 100% waterproof or do you want to keep it with its worn and vintage look?
The dial looks great and the hands might need a slight clean / tidy up, although there any many vintage ones around if you just need one or two of the hands. New hands have very bright orange or yellow colour and dont always look right on a 145.013
For me I'd replace the crystal, all the crowns and pushers and have the movement serviced, also restore and fix the bracelet. Pressure test so that you can wear it everyday without worry. The next decision would be to restore the case or not, and that really depends if you want the vintage look or a much newer look. Any parts removed should be kept as they may have value if you decide to sell the watch in the future
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