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    Re: [Sextants] Tamaya sextant designs & WEB ARCHIVES
    From: Joel Jacobs
    Date: 2009 Jan 06, 17:47 +0000
    I was surprised that some of the participants on the old NAVLIST haven't chimed in to recall the discussions, and I am also surprised that you found it difficult to retreive some of the prior posts. I now see that the old list participants are lkely not memebrs of the sextant group so I've copied them here.
    I have not got time to participate on any list except infrequently, but I am happy to be able to help just a little. Here is what a few key strokes using google returned. Note that the archive that hold these records is on i-DEADLINK-com and also note the names of the participants.
    All about Simonsen and Coast Navigation School http://www.i-DEADLINK-com/lists/navigation/0602/0029.html
    About Micrometer drums
    About the MS 633 and private label sextants
    In respect to the MS 633, if that was the same as the economy sextants made or distributed by Nautech, Simex, and Mac, that all had the same features, they were private label sextants and not of the same quality as the upscale Tamaya sextants. We sold our version under the brand Nautech Master. You can compare this picture and features to the above and should find them close to the same. See http://www.maritime-antiques.com/boatblog/nautech-maritime-sextant-auction-receives-ten-bids/
    I have meetings to attend so I must sign off now.
    All the best,
    Joel Jacobs--
    Visit our website

    -------------- Original message from "Trevor J. Kenchington" <Gadus@istar.ca>: --------------

    Thank you, Joel. That was helpful.

    You wrote:

    > In the archives, there should be the history of much of what has
    > been discussed lately on this site about sextants. On the earlier
    > NAVLIST, I recall detailed threads that covered these subjects in
    > detail. Those discussions covered:
    > the founder of Coast Navigation, Captain Simonsen, and the Simex
    > brand.
    > The problems with small scale (7/8) sextants, ie the law of similitude
    > when the micrometer drum was invented and by whom
    > when the endless tangent screw was introduced
    > Private label sextants such as NAUTECH, SIMEX and MAC
    > and so on and so forth.
    > Perhaps some one can dig out those old threads.

    Unfortunately, the Yahoo archiving system doesn't seem to be working
    well. Searching on "Simonsen", "Simex" or even "micrometer" doesn't
    bring up any messages save those posted in the last few days. I tried
    searching for messages that I had posted and it would not admit to
    any before June 2008, whereas I have been contributing occasionally
    to this list for a number of years.

    The NavList archives do have far more information (and more than
    Google found for me when I tried a general search, rather than a
    search of those archives). But I still don't have answers to my

    A quick look at the archived messages produces firm statements both
    that Simex sextants were made by Tamaya and that they were not. Those
    who posted on the old Navigation-L were closer to unanimity that your
    Nautech instruments were all made by Tamaya and that the MAC ones
    were not -- even though they look identical in every detail save the
    brand name. Current auction prices for used sextants are
    significantly higher for an old Tamaya than for a Simex or MAC of the
    same vintage. I'm still trying to figure out if there is actually any
    difference in the instruments themselves (beyond the obvious options,
    such as a choice of telescopes).

    > A couple of comments off the top of my head. The Tamaya MS 1, MS 2,
    > MS 3, were the Tamaya model designations which were the same as the
    > catalog numbers, 635, 636, 637 so that the same sextant had two
    > designators. The differences between the models were NO lighting w
    > 7 x 35 scope, lighting w 7 x 35 scope, lighting w 7 x 50 scope.

    In that case, Tamaya are doing what the auto industry does: They are
    re-using old model designators for new models. At least, their
    Japanese web site uses MS-1L, MS-2L and MS-3L for what seems to be
    the same sextant that sells as the 733 Spica in North America.

    > The MS series was a top of the line sextant using the same frame,
    > as the 733 which succeeded it. The difference was that the mirror
    > sizes were smaller. For example, the horizon. mirror was 50mm vs
    > 54mm in the Spica which replaced it. It has a round handle which
    > carried two "C" type batteries compared to the two "AA" in the 733.
    > There was a version of the MS 2 that did not have batteries which
    > was designated a 635 and one that was fitted with a bigger scope
    > that was the 637. Basically, they were all the same and so close in
    > appearance that they could be confused with a MS 733 Spica.

    That explains the 635, 636 and 637 but not the 633, which shows up
    regularly on e-bay. The 633 had/has a noticeably different frame from
    the 733, with the MAC and Simex Mariner resembling the 633.

    Trevor Kenchington

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