Hi-Mound HK-708
I bought this key at the Bishop Auckland Rally back in around 2001 for £10. It’s actually a decent key to send with and I used it frequently on the air as I preferred it to the Kent key I had been using. It’s got a smooth action, though the adjustment screw is a little coarse for adjustment. It doesn’t have the original knob either, though I like the rounded one more than the usual flat top that the Japanese keys usually have.