Well yes its much nicer than those nasty plastic ones, i'll take a pic if i remember. However i think that even replacing with any normal decent leather nob would be an improvment.
Most HGT gear knobs you'll find are extremely worn as with the steering wheels. Buying a HGT knob from Fiat costs around £80, the best place to buy a similar knob to the HGT but without the numbering is from Momo.
The knob below is very similar to the HGT one, is full leather and costs £45. Its called the Momo Anatomic Short.
Yup have to same my knob is well worn but my steering wheel isnt. Certainly not brand spanking new, but stitching etc still visable, and not all mushed up.