Firstly I’m fortunate I have help from others abomination sword so from what I read I’ll start with this from another sword enthusiast
This sword was made during a time in Japan called the Sengoku Period in the early to mid-1500s. At this time, sword making was a very localized industry.
One of the larger sword producing regions was in Bizen, and they supplied many of the swords during this Sengoku Period. The Sukesada name can be thought of as a company name in today's context, and not a single smith churning out thousands of swords, which is impossible. Therefore, each Sukesada sword, regardless of the signature, should be judged on its individual merit.
The mei on your sword is not considered "chicken scratch" writing. The characters are properly formed. I know because I read and write kanji. It's hard enough to write properly with a pen and paper, let alone chiseling it into metal. You can see some Sukesada mei online that have many characters, but are indeed "chicken scratch" because the strokes are poorly made with uneven depths and overlapping strokes.
However, I can say that your sword is not a Sukesada that would be considered as a high-art sword that was made by the master smith himself. These go for much, much more money.
What you have is mostly likely a mass produced sword, but it still shows very distinct Sukesada characteristics such as the Bizen hamon and grain, and the graceful curvature of the blade. This is Steve , my take on this Because Every sword is judged by his own individual merit and Because so many persons signed these mass produced swords some were made better or worse depending on the smith! Also I’m not sure what I got from this feed someone said that the mei wasn’t copied or forged or they would have used the long signature? And If someone isgoing to make a gimei copy, this name probably would notbe chosen, as there simply wouldn't be much, if any, profit. As quoted by John V Again because so many smiths signed this sword it should be looked at as quoted in this feed qualities? Sugata? Jihada? Hamon? I’m hoping my sword reflects all of the above as one of the better swords that was made by the smith Can anyone elaborate for this feed and what there opinion is by looking at the pictures of this sword
I know it would need to be in hand for a accurate assumption but I will take any opinions !!
Note: If I misrepresented any one wasn’t my intention
Steve