Thread: SEIKO - Cal.4R36 and Cal. 4R36A - what is the difference

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  1. #1
    Member jivkonik's Avatar
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    Question SEIKO - Cal.4R36 and Cal. 4R36A - what is the difference

    Hi everyone!

    I have this beautiful watch for about a month.

    SEIKO 5 Sports - SRP170J1 - Cal.4R36A




    More pictures HERE

    I'm wondering - what is the difference between SEIKO Cal.4R36 and Cal.4R36A?

  2. #2
    Member hans caravan's Avatar
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    Re: SEIKO - Cal.4R36 and Cal. 4R36A - what is the difference

    Lovely photos! The "A" following the caliber number just means it's the first generation. "B" would be the second...

  3. #3
    Member jivkonik's Avatar
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    Re: SEIKO - Cal.4R36 and Cal. 4R36A - what is the difference

    Thank you for the fast response Hans!
    CITIZEN Skyhawk A-T
    Polar s725x
    Suunto CORE Light Black
    ORIENT Crystal 3 star Automatic
    SEIKO 5 Sports - SRP170J1 - Cal.4R36A

  4. #4
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    Re: SEIKO - Cal.4R36 and Cal. 4R36A - what is the difference

    Quote Originally Posted by hans caravan View Post
    Lovely photos! The "A" following the caliber number just means it's the first generation. "B" would be the second...
    So if I understand correctly, at the time of this writing (2013-02-19), 4R36 and 4R36A are two names for the same thing (since there doesn't seem to be a second generation yet)?

  5. #5
    Member hans caravan's Avatar
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    Re: SEIKO - Cal.4R36 and Cal. 4R36A - what is the difference

    Quote Originally Posted by k_sze View Post
    So if I understand correctly, at the time of this writing (2013-02-19), 4R36 and 4R36A are two names for the same thing (since there doesn't seem to be a second generation yet)?
    Yes.

  6. #6
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    Re: SEIKO - Cal.4R36 and Cal. 4R36A - what is the difference

    Hi .. I just bought Seiko SRP165J1 ... and the movement is 4r36a ... there's made in Japan on the dial and back of the watch .. I guess there 4r36a and No1 after the J in SRPJ1 means that this is the first generation of this watch which was made and assembled in Japan ..

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