RE-6c-10C, Ohio Sales Tax - Reserve Litho Cleveland O. - 6¢ - Control letter and serial number - Roulette - Type 1 15.3mm "Small Map" Watermark (Sideways). Staple holes present because these were from a stapled booklet.
Words of advice: There were many printers, types, watermark, separation method,colors, etc to these "stamps", so a 100% identification is not always possible. You may visit information at the Stamp Forum at this link for further information.