program. The purpose of the program was to help improve sales, improve retail sales reps' knowledge of Epson products and to address Epson customer service in a retail environment. Reps were assigned on weekend shift, typically around 12–20 hours a week. Epson started the Weekend Warrior program with TMG Marketing (now Mosaic Sales Solutions), later with Keystone Marketing Inc, then to Mosaic, and now with Campaigners INC. The Mosaic contract expired with Epson on June 24, 2007 and Epson is now represented by Campaigners, Inc. The sales reps of Campaigners, Inc. are not outsourced as Epson hired "rack jobbers" to ensure their retail customers displayed products properly. This frees up their regular sales force to concentrate on profitable sales solutions to VAR's and system integrators, leaving "retail" to reps who did not require sales skills. Personal computers Starting in 1983, Epson entered the personal computer market with the QX-10, a CP/M-compatible Z80 machine. By 1986, the company had shifted to the growing PC compatible market with the Equity line. Epson withdrew from the international PC market in 1996. The company still produces and sells PCs in Japan as of 2022. 21st century In June 2003, the company became public following their listing on the 1st section of the Tokyo Stock Exchange. Since 2017 the company is a constituent of the Nikkei Stock Average index. Although Seiko Group Corporation (f/k/a K. Hattori, Hattori Seiko, Seiko Holdings) and the key members of the Hattori family still hold approximately 10% of the outstanding shares of Seiko Epson, the company is managed and operated completely independently from Seiko Group. Seiko Watch Corporation, a division of Seiko Group Corporation, produces Seiko timepieces in-house through its subsidiaries as well as delegates the manufacture of some of its high-end watches (Seiko Astron, Grand Seiko, Credor, etc) to Epson. The company makes some of the Seiko's highest grade watches at the Micro Artist Studio inside its Shiojiri Plant in Shiojiri, Nagano. Beside the Seiko timepieces, Epson develops, designs, manufactures, markets, and sells watches under its own brands such as Trume, Orient, and Orient Star. In 2004, Epson introduced their R-D1 digital RangeFinder Camera, which supports Leica M mount and Leica screw mount M39 lenses with an adapter ring. This camera is the first digital rangefinder on the market. Because its sensor is smaller than that of the standard 35 mm film frame, lenses mounted on the R-D1 have