The 6306 is made for the Japanese domestic market. From the appearance they looked almost identical but
1.
6309 weighted 108 gm as compared to 102 gm of
6306 due to a finer finishing; i.e. the case is well polished.
2.
6306 diver differs from the 6309 in that it used
the cal. 6306 movement with 21 Jewels and 6309's with 17 Jewels)
3.
6306 has hacking feature
4.
6306 has the Kanji (Japanese) day wheel.
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