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Early Duetron B

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This is a very old Nihon Seiko Duetron B. It is nearly identical to a Unitron branded Duetron B shown in a picture. These are designed to fit 1.25 inch eyepieces. The slightly different chrome plating color and the lack of either a Unitron or Polarex brand indicates that it is probably from the very early 1950’s, but that is just a guess. That is also indicated by the fact that it is actually a bit larger than 1.25 inches by perhaps .003 inches. That means that it will not slip into most 1.25 inch focusers with the supplied fitting!  My guess is that this is one of the first of these produced by NS and they had not yet mastered the conversion from .965 to 1.25.

To remedy this situation I made a couple of special adapters. The first is an actual 1.25 drawtube for the device. With this it will fit in any 1.25 inch focuser. I also made an adapter from the 1.25 to the Unitron drawtube. So it can now be used in your Unitron scope. This adapter also makes it possible to use standard 1.25 accessories in your Unitron.

The original item has not been modified in any way so it will still be appreciated by a Unitron collector and connoisseur.

US sale only. Paypal only and I handle the fee. Free CONUS shipping.