This bottle is the 4 ounce version as noted by the K928 on bottom - research shows this item was available during the ca. 1925-1931 period, and most have selected ca. 1928 as a probable adoption date. The vast majority of the ssample had the “K”
basemarks of the Kearns-Gorsuch Glass Co. Screw top lid. Please see picture of damage to back side, at the rim of the screw top. I do not know how to clean inside of these bottles - leave that to the collector.