High Standard introduced their Sentinel revolver line in 1955, at the request of Sears Roebuck which was a major customer and owned quite a bit of High Standard stock.  Sears wanted a low-cost kit gun or “tackle box” revolver to sell under their J.C. Higgins brand.  It was sold by Sears as the J.C. Higgins Model 88.  The J.C. Higgins guns were given distinctive grips, cylinder flutes, and cylinder release pins.  Private label versions of the Sentinel were later made for Western Auto (the Revelation Model 99) and Armamex (Colonel Rex Applegate’s company in Mexico).