What model is this watch please…

I hope someone can help me.

This was my auntie's watch and I inherited it upon her death.

It has the original box, paperwork, leather strap and I believe from the inscription it was for working at the company for 21 years.

According to the paperwork it is movement number is 18138064 and is 9ct gold. I looked online and the movement number seems to date the watch to 1961. I don't want to open it because I do not want to scratch the case as the watch looks to be almost immaculate…

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