On 13 January 2019, "TheMaskedBoi" posted a picture and asked the possible translation of the inscription on the sword he had purchased at the time, which was 正方太平一夫. As "TheMaskedBoi" did not post more pictures after several requests, "Guido" provided a witty translation on 14 January, based on what he had seen, that the text meant "made in China".
Recently I have come across a sword which has exactly the same appearance as presented by "TheMaskedBoi". I myself do not think it is a blade of great value, but for a more accurate assessment, and to bring the subject to a more reassuring conclusion, I am attaching more pictures of the sword. The nagasa size of the blade is 70 cm.
I would also be interested in a correct translation of the inscription. As a point of interest, I note that the online translators Google Translate and Amazon Translate that I tried give different results from "SteveM's" translation, and the translator DeepL refused to accept it as Japanese text, but interpreted it as Chinese (also with a different result).