This is a very rare Gruen Precision Explorer Watch in Stainless Steel with a beautiful orange seconds hand. It features lume on the numbers and on the hands. Calendar. Fast adjust feature only having to go back to 7pm to advance the day. It keeps decent time around +4minutes a day. Would recommend to get it serviced. The bracelet is amazingly comfortable having Speidel technology. The crown is crispy and makes a great sound. I got another Explorer watch so don't need this one anymore.