JP,
Concerning your request, a new Topic has been posted by Jean, a new French member. Subject: identify his sword from pictures (school/age) Ray and myself will go for Uda school, Nambokucho. Now you will say: why this kantei? It is very difficult to answer. First it requires for this kantei to have seen a few Uda blades to understand the school.
http://www.militaria.co.za/nmb/topic/28359-find-info-on-muromachi-blade/
Begin by asking the question: why Nambokucho? What are the features of a Nambokucho sword? Does this blade fits these features, try to get the answer from the pictures.
Now the school, what are the Nambokucho two leading schools? Bizen and Soshu, these two school concentrates more than 75% of sword production. Now can this blade have features of one of this school, if yes, which one? Now how is the hada, is it smooth or tight or coarse, after it is a question of Study of leading Bizen smiths, of Soshu school, Masamune and his jutetsu (ten brillant pupils) and the school they begot. You have to reach a decision after weighing the pros and cons, the mune: generally Soshu influenced schools can have a mitsu mune. The hada of this blade is rough which makes one think of Northen country, this leads to Uda school, remains the iori mune not a feature for the school, thus Ray comments