If your Speedie is from 1967, the only thing you should do at the moment is put it in a safe place and don't let anyone touch it.
Do a bit of research and find out what the difference is between a completely original 321 Speedie and a "restored" one, take a deep breath first though.
And as the watch belonged to your Dad, it has a lot of marks and scratches that he made, it doesn't detract from the value of the watch in any way (as it's not a NOS cherry example) and in my eyes, would add huge sentimental value to the piece.
If it was mine, I'd get it cleaned, oiled and adjusted by a qualified/competent/trusted watchmaker and maybe fit a new crystal.
Nothing else, especially no polishing.
As stated by another forum elder "If you want a pristine moonwatch, buy a modern one - either brand new or a LNIB pre-owned one. The allure of the vintage Speedmasters is the originality."
And this thread is worthless without some pics of your watches.
Cheers
Jim
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