Show Ad Search for: Advanced Search Place Ad Browse Ads Search Ads Elto Quad and Speedster serial number plates Click to enlarge image. Contact Information Contact eltoquad More Information I have a few repro Elto Serial number plates left. Correct plate for all early Speedsters and the 1928 and 29 Quads. $37.50 post pd to US addresses. This Ad has been viewed 19 times.