Same watch I bought back in the 80s, Black Coral 980.031. Lume is barely there though after all these years. i wanted to see if I could restore it. Mine is in pretty good shape and was actually bought as a Heuer, but in mid 80s crashed motorcycle and needed to send it in for new crystal and bezel and face came back TAG/ Heuer. It is worth somewhere between 300-500 I owuld say. I have seen them go that high on eBay and elsewhere. not going to get rich selling it just keep it. It keeps great time after all these years. Typical quartz movement.