Pumaonly, These are all for the military .38 cal. Colt & Smith & Wesson revolvers. There are 5 types of this style , plus other sub-variations and modifications, all made at Rock Island 1892-1910 period in 3 colors (black, fair & russet). See Meadows pgs 152-168. Rock Island inspector/subinspector "HEK" was Henry E. Kelsey. They are not real rare. At Rock Island about 27,700 were made in 1909-1910, and almost 200,000 over all during the 18 yrs. Additiona quanities were made at other arsenals. As with most military collectables, value depends on condition, originality, sharpness of markings and scarcity. I see them for sale at shows from $50 to $600, depending on condition. Your three appear to be in good condition and may, or may not, have originally had a tie down ring at the bottom. Ed.