The model number of a Disklavier is normally not printed anywhere on the instrument itself. In most cases, you can determine the model number by the physical characteristics of the instrument and by looking for the DKC number on the control unit.
This PDF file will show you how to determine your Disklavier's model number, which is useful if you need to download its manual or determine whether it can be upgraded with newer features. The contents of this manual are also available for viewing here
.How to Determine Your Disklavier Model.pdf