Retro, heavy and chunky! Ticking strong. Old Orient model with metal day and date wheels AND Made in Japan, NOT plastic ones and made outside Japan like current Seiko and Citizen Orient In-House Automatic 21 Jewels. Japan signed on movement. Size is slightly larger typical dress watch. Bigger than a typical Seiko 5 men watch.
How to use the inner bezel:
Non-decompression diving time on the inner bezel: 20 M Can stay at 20 M depth for 45 to 60 minutes without decompression 30 M Can stay at 30 M depth during 30 to 45 minutes 35 M Can stay at 35 M depth during 15 to 30 minutes 40 M Can stay at 40 M depth during 0 to 15 minutes