For sale from my personal collection is a Vintage 1970’s Chronosport Navigation Computer in excellent vintage condition, fully functional.
First picture

This is a rarely seen vintage Swiss watch from British company called “Chronosport Special watches”. The advertisement from 1977 describes it as “Military air crew issue mathematical slide rule watch” A similar one, albeit an earlier version with Chronograph function, was covered by Hodinkee, and has been described as follows:
“In the original user manual, this Chronosport is described as “a real calculating machine,” and boy, is that the truth. Much like the Breitling Navitimer, it associates a slide rule and a chronograph to calculate average speed, convert between speed units, and perform all critical calculations required while flying. The focus on this type of functionality explains the plane emblem of the Chronosport brand; the stealthy black look and bright orange hands further complete the aesthetic. As can be expected, this tool watch is shock resistant and antimagnetic. The user manual will show you all the technological feats this "genuine computer on the wrist" can accomplish”. (Source: Hodinkee)

DIAL+HANDS: dial in extremely good condition with tritium lume and tritium hands. The dial looks like factory new.
BEZEL: excellent bezel, looks like brand new.
CASE: 36.4 mm stainless steel case in excellent condition – please refer to pictures
CASEBACK: stainless steel factory engraved caseback in good condition.
CROWN: unsigned, original crown
CRYSTAL: Plexy crystal in good condition
MOVEMENT: hand wound movement with day date function.
STRAP & BUCKLE: The watch comes on an as new leather strap.
ACESSORIES: copy of the user manual and of an advertisement from Jan 6, 1977

Please feel free to ask questions. I will be glad to provide additional pictures upon request.

The price is 950 CHF (Swiss Francs) or OBRO plus shipping at actual cost. Low ball offers will be politely ignored. The watch can also be sold through Chrono24, which provides a safe Escrow service. Watch and I are in Switzerland.
References
I have not sold watches on Chroncentric yet. However I have 100% positive feedback on ebay since 2006 and I have sold many watches on Chrono24. I can also provide references from OF.

All other pictures, in the order as available on the webhosting. First pictures is on the top left, the last pictures is down

Payment
bank wire or PayPal (please add 4.4% to the price to cover PayPal fees).
Conditions of sale
The large, clear unaltered pictures are an important part of the description.
I check the watch to be certain it runs when listed and I re-check before shipping.
Import duties, taxes and charges: Import duties, taxes and charges (typically collected upon delivery or pickup) are the buyer's responsibility and are not included in the item price or shipping charges. Please check with your country's customs office prior to bidding/ buying to determine what these additional costs will be.
Returns only accepted within 3 days of receipt if the watch is not as described and pictured and it is returned in the same exact condition as it was sold. Refunds will only be made upon a full inspection and will amount to the purchase price minus shipping and handling costs. Buyer is responsible for the return postage, insurance, and safe delivery of the watch back to me.
Shipping:
Insured and registered parcels by Swiss Post, DHL or Fedex. Upon prior agreement, the watch can also be shipped from Germany.
thanks for looking and Chronotrader for the space!
Stefan