Puchang-
The HB RB powdercoated aluminum handled tamper weighs in at about 470g, the handle with screw attached is ~178g. I believe it is heavier than the wood handled version, and the balance is perhaps a bit different, but still very nice. I do not own a rosewood handled tamper, but I recall the first time I picked one up to use it, I noticed it felt much lighter than my EPNW HB Compressore. The Compressore and HB Reg (aluminum) are close in weight IIRC.
From another member in the private Roadshow forum:
rjkramek wrote:Reg Barger HB logo'd
handle: Tall - African Rosewood
handle width: 1 13/16"
base: stainless steel, satin-brush finish
overall weight: 12 1/4oz
overall height: 3 1/2"
That's more like 350g for the wood handled version vs 470g for the aluminum, not allowing for differences in the piston (American curve versus flat in this instance).