In Japanese Sengoku period, the samurai generally equipped two swords, one long and another short. The samurai sword we see in the article should be the short sword because of the 6.5-inch length.
As the famous katanas from ancient times, the little sword also has a slam-bang name: Samurai Letter Opener! Great! not for seppuku, but opening your letters. I think cutting your bread with the stainless steel sword will be on problem.
You could grab one from Kleargear, this little gadget will sets you back $5.95 USD.