Mercury Vintage Digital Calculator Watch Untested

Got this vintage Mercury digital calculator watch from the 80s. It has that total retro vibe with the full keypad on the front and the black resin strap. It's got an alarm and a light function too. It is definitely used and has some scuffs on the face and buttons from over the years. I haven't tested it so I'm not sure if it just needs a battery or what, but it's a cool piece of tech history for someone who likes fixing these up.