[ncb123]

Not being familiar with any of the more modern Seiko divers, could anyone tell me on which watch Seiko first introduced a uni-directional bezel?

 

[IgniFerroque]

Second generation 7002 I believe.

EDIT: That's when their basic divers switched from bi directional to unidirectional, I'm not sure what the absolute first unidirectional bezel watch was.

 

[ncb123]

Thanks for that info.

 

[7s26b]

6159-7001???