Bell + Automatic = Bellmatic
First Seiko Bellmatic (alarm wristwatch) produced in far 1966, this first models they where only sold in the Japanese market. There are many different dial and cases models have but only two variations of movements in the Bellmatic series have: it is caliber 4006A and caliber 4005A.
4006A have day / date function, and have three versions 27, 21 and 17 Jewels,
4005A have only date and only one 27 Jewel version.
Both versions are automatic and dont have manual wind.
Like any vintage Seiko watch, Belmatic is not complete without an original metal bracelet, if dont have original bracelet, my advice is not to buy it.
This mine beautiful dark brown dial Bellmatic is caliber 4006 model 6021, date of produce is January 1972, it is all original Japan made.
Very nice vintage mechanical alarm wristwatch.