Ultra rare Sinar 8x10 bino reflex viewer binocular finder

Description

Ultra rare Sinar 8x10 bino reflex viewer compatible with all 8x10 Sinar cameras and 8x10 Horseman cameras.
Only the viewer is part of this auction.
Pictures with the camera serves the purpose of showing this item in use.
All images are genuine images of the item that is for sale.
Bundled items are shown on the photos.
All items will be shipped within 3 working days using registered airmail.
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I do accept returns if the buyer is not satisfied with the purchased item.
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Hasselblad A12 film back - CHROME - Great Condition. Condition is "Used".
The Hasselblad A12 film back is the quintessential 120 roll-film back for Hasselblad 500 Series medium format cameras (part of what is now known as the Hasselblad V System).  Unlike the original 'Hasselbald 12' roll-film backs, the A12 automatically stops on frame number one when loading and queuing a fresh roll (with the previous version it was possible to accidentally waste part of a roll if not careful).
The A12 fits twelve 'six by six' (56x56mm) format (a.k.a. two and a quarter inch format) exposure frames on a 120 length roll film.  This is a complete film back (also sometimes referred to as a film magazine) that consists of three main components, the exterior 'shell' (which mounts to the camera body), the 'film insert' where a roll of 120 film is to be installed, and the 'darkslide' which prevents film from being exposed when the A12 is not attached to a camera body.  Hasselblad hand machines (and serializes) the shell and insert components to match each other (shell and insert serial numbers match unless noted otherwise).
As part of Hasselblad's truly modular system the The A12 film back can be removed and reattached in the middle of a roll, allowing photographers the ability to switch between different film stocks without having to finish an entire roll.  As a safety feature A12 is designed so that it can't be removed from a camera body without the darkslide protecting the film.  Late versions of the A12 feature an integrated place to store the darkslide while it's not protecting the film; without a 'darkslide holder' care must be taken not to loose the darkslide from a shirt pocket or camera bag.
Key Features
Quintessential 120 roll-film back for Hasselblad 500 Series
Automatically stops on frame number one when loading
Fully mechanical
Twelve 6x6 format exposures per roll
Pressure plate & frame counter designed exclusively for 120 size/length roll film
Includes Shell, Insert, Darkslide
Shell and Insert serial numbers match unless noted otherwise
Black leatherette with chrome metal trim
Integrated keeper for side of film box for easy film-stock identification
Film loaded indicator