(Known) facts: The Gold Card 2 comes with a full 16MHz 68000 processor, 2MB RAM, FDD controller for up to three DD, HD and ED(!) drives, which gives you 720, 1440 or 3200 KB per disk. It roughly increases the speed of a standard QL by factor four.
Tested and working. The Li-battery is certainly flat, but this is normal for a device, that is almost 25 years old. Comes with the manual.
Price 170 GBP plus shipping cost. PayPal as gift or fees to be added. Ask me and I will check postage to your country, e.g. a tracked and insured parcel to the UK is ~10 GBP.