Welcome to the forum Darcy. I'd recommend taking some time to read through some of the old threads here to gain some more knowledge about the watch.
At the end it's up to you whether you plan to keep it or sell it, now that you probably have many people PM you with offers. If you plan to keep it, which I hope you do given it's from your dad, some people here can help guide you through for place where you can have it serviced first and foremost and so on.
To me the wrong case back isn't a big deal. If you are patient enough, you will find it one day. I've seen more than a few 2998 case backs for sale during the past 12 months.
Congratulations on receiving this beautiful and requisite watch. Cheers!
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