I'm pretty sure that's the original rubber dome HHKB, in contrast to the original Pro model (with a KB300 part number, and USB only) which has them fancy Japanese rubber domes...
I have to tell you, them fancy Japanese rubber dome key switches on the HH Pro 2 are pretty awesome. Yes, the typing experience is very different from the IBM PC AT 84-key keyboard. If you are like me, there will probably never be another key switch that is as enjoyable to type on as the buckling spring/capacitive contact key switch used in the PC AT keyboards. (The original IBM PC 83-key keyboards not so much - too clicky and not as smooth as the 84-key AT keyboards, not to mention unpractical layout) But if you ever decide to branch out with a "modern" key switch, so far, I haven't found anything better than the Topres.
It's really difficult to describe or explain what makes the Topre rubber dome key switches feel different from your run of the mill rubber dome key switch. Yeah, yeah, I know it's not just the addtion of the spring and the rubber is thicker for the higher force keys plus the slider mechanisms are precision engineered. It's probably all of the above plus the mostly outstanding Japanese build quality.
I compared my new HH Pro 2 with the crap Dell rubber dome that came bundled with my laptop port replicator. The iniital feel of the key presses is very similar, especially to the casual user. However, extended typing on the HH Pro 2 is strangely satifying whereas extended typing on the crap Dell rubber dome was just plain tedious.
I have a Topre Realforce 87U on order and will continue to post more unscientific and admitedly subjective feedback because for me, the typing experience trumps any data points that can be measured.
I do get a kick out of reading about ripster's and the rest of the gang's experiments and keyboard mods. Keep 'em coming...