Of all the mechanical vintage alarm watches we have heard, this one is the loudest! Absolutely a conversation piece when you demonstrate it! You wind the top crown to power the alarm. To set it you adjust the red tipped hand with the top crown to the hour/quarter required. You then pull out the crown for activation. The ringing starts when the hour hand pass the red tipped hand. The sound is cut off by pushing the top crown in. The silvered dial very nice although not perfect (We will remove any dust before it is shipped). The hands and hour markers are super. Only the minute and hour hands have lume, and all is intact. The 35,2 mm x 40 (lug tip to lug tip) x 14 (thickness) stainless steel case is strong with sharp edges and no dents. Inside the back cover with openings there is a second cover to protect the movement. The slits are there to let the sound out! On the inner cover the pin that takes the hammering is fixed. The inscriptions inside the outer cover boasts three Swiss Patents ( 238872, 319298 and 319643) and a reference number: 1568. The quality copper finished 17 jewel movement has timing screws and is “Adjusted”. The hammer is the steel colored piece closest to the balance. The running is well within acceptable margins for a vintage watch (+/- 15 seconds/day) and has not been serviced by us. We date this Technos Alarmdate De Luxe to ca 1960-65.