This genuine NASA design makes for a stunning bright white watchband that gives the watch an unmistakable space-strap look. It's a rarely seen watchband only produced by NASA during the development stages of the Block II Apollo CSM. Though never flown in orbit, they were the current issue during manned Thermal Vacuum testing (2TV-1).
The relevant configurations of the SEB12100030 blueprint were the 19" and 21½" pairs -203 and -204 made with beta fabric tape, and then for -205 and -206 made from Telfon-coated beta cloth folded with a single seam. Five or six 1-inch segments of Velcro pile were stitched at regular intervals from the Velcro hook end.
Although the watchbands for sale here aren't made from beta fabric, the alternative fabric was chosen for the same look and feel.
At 11 inches in length, one size fits wrists from 5½ to 8". Due to the spacing of the Velcro pile, wrist sizes at the upper and lower limits of this range have restrictions on which of the following two attachment techniques can be used. For the middle range 6¾ - 7½", either technique can be used.
For larger wrists from 7½ to 8" the strap reach has to be maximized by cinching the top springbar first and across the wrist before threading through the lower springbar.
For smaller wrists below 6¾" the strap has to pass underneath the watch by threading through both springbars first.