Very nice vintage watch you got there, excellent condition too!
Can't help with the value, but if that case is solid gold it sure has some value in the material (duh!). The brand is long gone I presume, bankrupt with the quartzcrisis amongst many others? Anyway, the brand isn't well known so little added value in that I'm afraid.
Doesn't really matter anyway, for you it has heritage with much more value than money can buy. Wear it in good health!