I forgot the flight case that is included in the Anniversary, that and the tube quality are the differences that have been described between Anniversary and Silver models, not to forget looks! Earmax was design as a transportable tube headphone amplifier, therefore the transport box for the Anniversary.
All Earmax Anniversary seem to be sold out in Europe and North America so those in Singapore could be the only available as new in the world. Seems to be a very nice shop you have in Singapore and this is also very unusual and gives you the important advantage of listening to the equipment before buying.
I bought my Earmax Pro used. It is not sold in Sweden so, if I upgrade to the Silver, I will import a new one from Germany, or maybe Singapore!
Hope you will be happy with your amp!
/Anders