In the 1990s Feather Industries Guardian Angel: multi-caliber (.22 LR/.22 WMR) 2-shot derringer-look-alike. (Uses a 2-round firing block that pops out like a magazine. Avail. in both sizes.) Double-action, 2" barrel, 5" long. Matte stainless steel, w/ black composition grips.
Don't know if this would be classified as a clip like the moonlips.