A visual comparison of the 7s26A & 7s26B movements...

Thread: A visual comparison of the 7s26A & 7s26B movements...

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  1. #1
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    A visual comparison of the 7s26A & 7s26B movements...

    as inspired by timcc23 post below.

    I posted this comparison and my take on the matter last year on another forum.

    The main an visible difference is the balance wheel and hair spring attachment. The 'B' has not only a different and adjustable stud(where the end of the spring is attached) but a new and also adjustable regulator. The regulator can be set for precise alignment with the spring which passes between it's bars/rollers and the space between the bars can also be adjusted. Like the regulator, the stud can be adjusted to take into account any slight variations in the coil wind and geometry of the hair spring. It is also suspected that a new material may be in use for the hairspring; one that could be more thermally stable.
    These changes seem to have occurred around the same time as the 6r15B appeared. Perhaps both movements now enjoy the same parts

    Other than this, I don't think anyone has discovered other differences between the 'A' and 'B' versions of either caliber.


    Picture courtesy of AndrewB

    One of my own 7s26 movements.
    Last edited by Pawl_Buster; August 25th, 2008 at 00:38.

  2. #2
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    Re: A visual comparison of the 7s26A abd 7s26B movements...

    There are schematic drawings around here somewhere. Or maybe that was 7s26 versus 7s36.

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    Re: A visual comparison of the 7s26A abd 7s26B movements...

    Quote Originally Posted by nhoJ View Post
    There are schematic drawings around here somewhere. Or maybe that was 7s26 versus 7s36.
    This picture shows the extra 2 jewels found in the 7s36 vs the 7s26...otherwise they are identical

  4. #4
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    Re: A visual comparison of the 7s26A abd 7s26B movements...

    Excellent post. As an 7s26 Samurai owner, its nice to see whats under the hood. Finished to a good standard, too
    If you're in Hell what can I say? You probably deserved it anyway

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    Re: A visual comparison of the 7s26A abd 7s26B movements...

    Quote Originally Posted by nhoJ View Post
    There are schematic drawings around here somewhere. Or maybe that was 7s26 versus 7s36.
    Did you look in the junk drawer in the kitchen??
    Seiko 6159-7010 Seiko 7S26-7020 (DONATED Towww.komen.org) Seiko 7N36-0AF0(SHC061Sawtooth)
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    Seiko 7N36-6A29 (SHC045) Seiko 4006-6070 (BellMatic-03-1967) Seiko 7S26-0350 (SKX779) Seiko 8306-8090 (Sealion- 07-1967)

  6. #6
    Inactive Isthmus's Avatar
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    Re: A visual comparison of the 7s26A abd 7s26B movements...

    Thanks AG. I'm saving this to our FAQ archive.

  7. #7
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    Re: A visual comparison of the 7s26A abd 7s26B movements...

    I am new to the forum. My first post.
    (1) Has anyone any info if/whether the 7s26A balance will fit into a 7s26B movement. I have to replace, and believe the A balance somewhat cheaper.
    (2) I live in San Diego, USA. any advice to source a replacement ?

    many thanks
    David
    San Diego

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