This NOS Seiko 7T27-7A10 from December 1988 is flawless - fully operational, and comes on the original strap A04BZ 18mm strap. It functions as a chronograph by hitting the top right pusher. The left pusher enables the split feature. Top sub is a 30 minute counter once the chrono is engaged. The bottom sub is a counts seconds, and the left sub works as a 24 hour clock and compass. 18mm lug width, 41mm lug to lug, 39.5mm case diameter I can provide function videos on request. **$425 shipped OBO, payment via PayPal G&S.**