Lost screen resolution option

Actually, this isn't a question about an Apple monitor, but it's the kind of thing contributors here seem to know about. Hope that's OK.
I've been happily using my G4 (1.25 Dual) with a Belinea 17" CRT (30 10 20) for some years, with successive versions of OSX. Just recently I opened 'Displays' in System Preferences and closed it, without altering anything, and the screen resolution immediately changed.
Now I can't change it back - evidently the original resolution is no longer shown in the drop down list. If anyone knows ANYTHING I can do to get it back again, I'd be eternally grateful, as this has ruined my Mac-using experience.
Thanks,
Andy

Thanks to everyone who replied, I sorted it out in the end!
Andy

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