Serial number is for ~1981, model case number is on the clasp, 791.917. That movement is from an era where parts are now scarce so if it doesn't work after a new battery has been fitted, it might not be economical to repair. In addition, I note the bracelet is damaged which is a shame as its not easily fixable, at least not cheaply.
Ladies gold quartz movement cocktail watches aren't massively in demand even when mint. As it is, It is worth the gold scrap value. To get a rough estimate, weigh it and subtract ~10g for the movement and glass then multiply the number by £17 to get its value for melt.