I love seiko automatic chronograph in the 70s - 6138, 6139, 7017 and 7016...
I once collected more than 10 pieces... Mostly 6138 n 6139!
However I'm too late into this, most good condition been grabbed by collector around the world and price is Sky rocketing nowadays!
Now still own this 7016, such a beauty, love it's mechanism, chrono counter both 30mins n 12 hours at 6... This make the dial so clean... I wish I can find other variants of this... The blue m yellow dial, another with different case...
Recently also read a Swiss brand actually bought this movement and make Their watches that time
If I can bump into a good condition all original
bullhead
UFO
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I think I will still pull the trigger if price is right!