cazalea
[Seiko Moderator]
20993
A more exhaustive description of the differences in these movements
I have several movements in various states of disrepair, so it was interesting for me to locate this data which another guy has put together:
The extra jewels in question are in the top plate:
cap jewel for upper escape wheel
hole jewel for upper third wheel
cap jewel for upper third wheel
hole jewel for upper seconds wheel
Cap jewels don't add much in my estimation; they just sit on top of the hole jewel, as a "Cap" to keep things out and oil in. Hole jewels are better than holes in the brass plate as they have less friction and hold oil better. Both cost more to produce and I guess Seiko decided not to spend the extra money on the newer (much larger production numbers) movements.
The hacking feature is one small extra piece that stops the second hand, which also requires a groove in the plate next to it, for clearance. Otherwise the movements are essentially the same.
I hope this helps answer your question.
Cazalea
One of my most precious Seiko watches:
Today I am enjoying my Seiko ref.:6306-7001 an excellent diver from the master Ikuo Tokunaga. All the best. Juan ...
Thanks Alkiro, for your kind words.
All the best for you and your family and Merry Christmas!! Juan
The original Turtle?
Very, very cool! Glad you\'ve shared it with us Has the Lollipop on the right side, too - unlike the re-edition.
Yes sir!...
..this ref. 6306 is for the Japanese market and manufactured from 1976 to 1981. And its caliber is better than the ref. 6309 for USA and RW market. Thanks KMII!!! All the Best. Juan
Great watch! Got the turtle bug a week ago and got my first within!
Would love to hear more abt the original 6306/6309! Any idea where the differences are, between the jdm 6306 and export 6309? How so is 6306 better than the 6309? Looking forward to learn!! Thanks! Tony
Hi Dear utcpluseight,............
....in the case and the bezel there are small differences, the biggest and most important are in their calibers: The 6306 has 21 jewels and the hacking function also known as hack or stop seconds, which is when the crown is pulled out and in a 6309 there ...
thanks Juan for the explanation!
I didn't know that they used to have different movements fitted for the JDM version. Unlike your 6306 vs 6309, the recent Seiko 5 and 4R3x's movements are virtually the same except for the assembly locations. Have a great Christmas & happy New Year ahead!...
A more exhaustive description of the differences in these movements
I have several movements in various states of disrepair, so it was interesting for me to locate this data which another guy has put together: DIFFERENCES in 6306 6309 The extra jewels in question are in the top plate: cap jewel for upper escape wheel hole...
that is real treasure of knowledge, Cazalea! Thanks!!
It's amazing that you have these photos to differentiate them apart! Definitely deserving of being our Seiko mod! Merry Christmas and a wonderful New Year ahead! Tony
To be perfectly clear ...
The guy who wrote article I referenced (years ago) had already taken the photos. I just found them, did some clean-up, then put on the annotations and arrows to make it clear. Cheers, Cazalea