This is a very nice watch! Citizen 57-1017 which is a dual time or / and chronograph. Weirdly you cannot run both together, it has to be in dual time mode or Chronograph mode. I won this on eBay for £15! granted it had some issues with the pushers not working correctly. One would not work and the other intermittently. I stripped the module down and cleaned it all and then re-seated it back into the case in the correct position and now all functions work correctly. Mid 1070s I think, nice design to the case and the screen layout. In chronograph mode a scale runs across the screen timing the seconds. Its cool now so in the 1970s this must have been very futuristic! I do like hexagonal shaped watches!