Ortholux I Unique Nosepiece

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I'm an Ortholux I hoarder and I'm wondering if any fellow Ortho collectors have ever run across one of these "428" nosepieces before? I love the look of it because it's buff (1970ish) chrome and more reminiscent of the Orthoplan/Ortho II designs - ie, numbered slots, slider slot, 5 position, internal spring that engages the position detents. Surprisingly, however, it still uses the 170mm tube length relay lens although the Ortho I infinity relay lens fits it beautifully.

I had to buy a complete Ortholux I just to acquire this nosepiece and lurked around Fleabay for about a year before I paid the "Buy It Now" fortune it cost. It came with a very pristine 40X Phaco (Zernike style) objective and someone had rigged the stage up to be controlled by X and Y axis servo motors... the stage is a plumbers nightmare but an oddity none-the-less... a bit like looking at the Elephant Man - you don't wanna see the spectacle but can't divert your eyes either!

I would love to find another one of these nosepieces, but, in twenty years of collecting, this is the only one I've EVER seen. If someone could tell me more about it, I will be ever grateful!