Also fact that it was just back from an Omega service - so unlikely to be running any better.
Think based on serial number it's from 1972 - so 45 years old. Good to know even at this age Omega still has the parts & will service them.
I can only comment based on my much more modern Memovox which has a gong. The Omega is quieter - though still noticeable. Probably wouldn't wake you up in the morning. However - loudest alarms are my cricket & Oris both of which are very loud.
As to accuracy of setting, based on experience so far prob within 5 mind, though closer to 3. Not exact mind. Though as has both hours and minutes hands to set alarm, it is more intuitive & easier to set in first place - as the Memovox is on a disc in the centre.
Cheers
JML