Two first digit from the left are handle code.

Plating

1. 1- Polished Gold, Matt Gold

   2- Polished Chrome, Matt Chrome

   2B- Economic

   3- Chrome

   4- Polished Gold, Matt Chrome (LUX)

   5- Polished Gold

   6- Olive

   6M- Matt Olive

   6B- Beige

   7- Polished Gold, Polished Chrome

   8- Dark Gray

   9- Satin

Type

1. 1- Key

   2- Switch

   3- W.C.

   4- Apartment

   L- Apartment Long

   M- Post Box

   S- Regal

   R- Rosette