Peter - you are off to a great start on what is a very well sculpted bust.
John - digital modelling is where all of the 'sculpting' is done on a virtual head on a computer using a tool such as Sculptris or Zbrush and the master is3D printed. As Stephen wrote, it will be the future; different skillset that 'putty sculpting' and an ability to produce the same figure in different scales. I see Andrea have started to do this, or as some do produce a 1/16 full figure and a 1/10 bust both of the same subject.
I am sure Peter is more knowe]ledgeable on this than me, but 2D illustration saw a similar change whith digital art. I remember speaking to a sci-fi artist, Tim White, who said that it was increasingly difficult for him to compete with computer guys becasue of the speed of their turn-around, and ability to make chages: you want the sky pink rather than blue, easy to change.
Richard - the Russian recasters seem to be getting ever more prevelent on Ebay, if the bust is less than half price, is described as not having a box and from Russia the chances are it is a copy and should be avoided, even if the price is tempting.
Peter - sorry for this post going a little off-topic
Peter