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Nihon Seiko 133n ?

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#1 Rudi Bjoern

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Posted 29 February 2020 - 01:43 AM

I have wished to own a small vintage refractor for a long time and a couple of weeks back, I bought a "Unitron 133-n Junior". It is going to be placed in our living room (wife accepted it!!!)

When I got it, I immediately noticed, that it didn't say Unitron anywhere. With a lot of help from fellow astronomers on the danish forum astronet.dk , I learned, that it might be a Nihon Seiko (see the "N.S. Patented" print on the focuser on the photo below): https://www.astronet...&p=14277#p14277

 

 

I am trying to find out exactly which brand, model and year it is???

 

I have trawled the internet (including this forum), but I can't find any references to the model. Some close, Unitron 133-n and Unitron 760, but I guess, that since mine doesn't have Unitron printed on it, it isn't a Unitron.

Does the "N.S. Patented" mean that it is made by Nihon Seiko or merely that it is a noname made on licence?

On YouTube, I found, and watched, several very interesting videos by Dave Trott, and in this one, Dave mentions a Unitron 760, that, besides the "Unitron" print, looks exactly like my telescope:

(Click image to watch the video)

MysteryUnitron.jpg?raw=1

 

But I can't seem to find an exact match??

If anyone have some material about this telescope, I would very happy, if You would share it. For example an old advitice or catalog?

 

The tripod legs are extremely pointy, so one of the first things I need to do, is make some "shoes" for them (3D print), to protect our wooden floor.

And also make some sort of spreader, that can be mounted without making holes in the tripod. It seems, that theese models didn't have any fixture, chain or spreader.

 

Here are some thumbnail photos, click images for larger versions:

6_s.jpg?raw=1  8_s.jpg?raw=1  10_s.jpg?raw=1

 

12_s.jpg?raw=1  14_s.jpg?raw=1

 

16_s.jpg?raw=1  17_s.jpg?raw=1

 

18_s.jpg?raw=1  4_s.jpg?raw=1

 


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#2 Bomber Bob

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Posted 29 February 2020 - 08:10 AM

The Unitron Experts will chime in, but it sure looks to be Nihon-Seiko to me, and I agree with N.S. Patented mark.

 

Maybe the "n" in the Model Number refers to the modified focuser -- with its long manual drawtube?

 

Very Cool Scope!


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#3 starman876

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Posted 29 February 2020 - 09:14 AM

That is a Unitron without the Unitron name on it.  It is a model  760.  


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#4 sdedalus83

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Posted 29 February 2020 - 09:29 AM

 

And also make some sort of spreader, that can be mounted without making holes in the tripod. It seems, that theese models didn't have any fixture, chain or spreader.

At the top of the bottom section of each leg, there is a bracket bolted on which has a stud for attaching a spreader chain.


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#5 combatdad

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Posted 29 February 2020 - 10:04 AM

That is a Unitron without the Unitron name on it.  It is a model  760.  

That would be correct.  Check out the UnitronHistory website for more photos: http://www.unitronhi...tron-model-760/.

 

Dave


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#6 Terra Nova

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Posted 29 February 2020 - 10:27 AM

Johann and Dave, you got up to early and beat me to the answer! I concur, 760.


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#7 Rudi Bjoern

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Posted 29 February 2020 - 10:31 AM

Thanks for the help. Unitron 760 it is then!
I am aware of the Unitron History site, but still, I couldn’t identify if 100%

#8 starman876

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Posted 29 February 2020 - 10:58 AM

Johann and Dave, you got up to early and beat me to the answer! I concur, 760.

I think you got up late Terra flowerred.gif


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#9 Dave Trott

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Posted 29 February 2020 - 11:24 AM

I agree that it is an unbranded 760; a very nice and rather uncommon scope. You will not see these nearly as often as a Unitron Model 114. The shorter focal length and the tiny focuser mounted on the slide-out drawtube make this a completely unique scope.

 

Glad you enjoy my videos, Rudi!


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