Interesting watch and heirloom.
The serial 2249x is an early, but correct range for the reference 165.024-64. Production date was late 1965 or very early 1966, so it took some time before it sold ;-)
Your dial was meant for a reference 14755 or an early 165.014 (production no later than 1963). The first 165.024 was the subreference -63 (produced from 1964) and didn't have this dial. And there were no transition period between a 165.014-62 and a 165.024-64. This dial was never found originaly on a 165.024 IMO and yours properly just had the dial changed at service, because the watchmaker had it in his parts box or your granddad just liked the design of the earlier one.
Furthermore the bezel on your watch was much likely also changed, since the 165.024-64 and especially the early ones, had the type 2 bezel below and not the type 3 like yours. Again, properly just done at service, since the quality of the type 2 was quite poor.
Nonetheless a nice watch and many will find great value in the parts, matching number/papers etc, but it didn't leave the factory in this configuration - IMO.
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