What is the make and caliber of an Iver Johnson Arms and Cycle Works 5-shot Owl Head pistol?

The maker of your revolver was Iver Johnson Arms and Cycle Works.This 5 or 7 shot revolver was called the Birds Head grip model,and was made from 1873-1888.IT was chambered in .22cal(small frame)32cal(medium frame)and 38,or 41cal(large frame).Yours will have either a 2 1/2in barrel(small frame) or 2 7/16in barrel(large frame).I must include that barrel length,s of 10in.have been encountered with this model.