This photo is from December of 1958, and shows a pink metallic Hi-Standard Sentinel Model 9163, a small .22 caliber revolver.
High-Standard offered the 2.375 inch snub barreled Sentinel in three different color anodized aluminum frames. These guns had nickel plated cylinders, triggers, and hammers. The round butt was made of ivory colored plastic. The 9163 model was made between the years 1957 and 1962. There is a High-Standard Collectors Association.