Bought this about 4 years ago as an investment and it's performed well. With current semiconductor/memory pricing, an industry in which hafnium is an essential material, I'd expect the value to increase but sadly I need to sell to pay taxes from other investments last year.
Current market value is ~$9.4 per gram so market value of the bar is ~¥146,000 but selling at a discount in recognition of the fact this is an obscure investment material.
Face to face trade cash only, any station between Tabata and Shinagawa on Keihin-Tohoku or Yamanote line.