Top quality, made by Readspeed. Unlike many other Lambretta rear crownwheel sprockets on ebay, these Rear Sprockets have the teeth cut using the superior "Hob Cut" method, instead of the "Stop Drilled" method, resulting in a far superior sprocket than the current cheaply made ones available elsewhere. The hob cut method also insures that your chain runs smoothly over the sprocket prolonging chain life. It also has the added bonus of being lightened in weight. 
 
 
This is the 46 teeth version.