Help needed for model HD 178.021 watch I inherited

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Good day, I am from South Africa. My grandfaher passed away almost 20 years ago. I have inherited an Omega watch that he owned. He received it as a 30 year long service gift from Yskor (company worked for). I have no idea when the watch was manufacured.

On the watch I can see it is an Omega Electronic f300 Hz Chronometer. There is a paper with it indicating HD 178.021

The watch is gold with a stainless steel strap what looks like it is gold plated.

I cannot find the exact model online anywhere.

I need to insure the watch and need more info on it and value / replacement value.

Any assistance would be great.

Thank you Andre