There are many varieties of this juicer. These juicers may include mould numbers. The glass the pip collectors sit on is flat. 

Known numbers for clear glass: Not known for this type

Also see: Mould Numbers  

Available in a variety of colours: Including clear, green, flint, amber, pink

Also see: Crown Crystal Glass Co. Ltd. (Australia)

Available in a variety of sizes/weights: 

This juicer has a middle reamer cone.

Also see: Crown Crystal Lemon Juicers