Standard Catalog of Firearms 17th Edition page 605. H&A revolver with birds head grip. Good 400, Fair 175, Poor 75. Has a round-ribbed (hex) barrel with trade names as: Acme, Blue Jacket, Captian Jack, Chichester, Defender, Dicator, Hopkins & Allen, Imperial Arms Co., Monarch, Mountain Eagle, Ranger, Tower's Police Safety, Universal and XL.