FlorianB

In this case rather „koshi kiri sukashi“ because it looks like a lattice with plants (and birds?). Sometimes slanting lines are associated with fog. Weird anyway.

I want to hint to the plants on the reverse: on the left is hagi (bush clover), on the right we see silver grass or obana, both connected with the end of summer and the beginning of fall. The motif on the rolled up fabric comprising a dragonfly and apparently nanakusa (seven herbs), also autumnal symbols. Maybe this time of year helps to indentify the strange tool?

Last one Tembo-style, signed 春 貞(?) Haru Sada (?)

The problem ares the differences in the tail-like form. Some show a widening at one end, others an even opening. Some have those lines beside, others not. I can’t even decide if it is a positive or negative sukashi. In the last Tsuba the design is part of a bizarre landscape and thus clearly positive opening. I think, in repeated copying of this detail the original idea got lost - or changed. Some of the examples above reminded me to deterioration like worm eaten wood.

Maybe the shinsa team got the insight that the traditional classification system of the pre-Edo works is based on pure speculations…

I think the larger size of the butterfly and its elaborate shape together with the existence of a hitsu ana lead to a Tosho instead of Ko-Tosho attribution. Today the NBTHK is more cautious about using a „ko“ prefix anyway. For me the surface looks O.K.. If You compare the surface of Tosho Tsuba You’ll see a variety of finishings. There’s no rule because some Tsuba have been more cared for, other suffered more or less through the centuries. And, yes, as Jean pointed out it could be a younger revival piece.

I own a modest Tsuba with Tanabata festival motif. It depicts several papers with inscriptions hung in bamboo trees. Note the shape of the one upper right (upper left on the ura). I wonder if such paper (used for what? Uchiwa fans?) is the origin of the sukashi in question.

One of my favourites - an all time classic:

It seems that the Hoan smiths have had difficulties to earn their living. The Shodai and the nidal worked mainly for the Asano but also for other clans. The reason for this seems to be meagre wages: the Shodai received 10 Koku rice by the Asano which is said to be little. It is not mentioned they sold their works to civilians like wealthy merchants. Possibly that’s the reason they where not prosperous like other schools and changed business later. Their works have been made for an exclusive circle and not for masses like Akasaka so the demand was limited.

There’s an interesting discrepancy in the dates. If the first Generation died 1613 or 1614 the Nidal was 13/14 years old. Very young at least. It is mentioned in the sources above the Nidai became the head of the family not until 1645 (thus explaining the later death date of the Shodai in Markus’ list). If the Shodai died at the earlier date, the school was „headless“ about 32 years.

Re-reading the topic I understand You referred to the shape of the piece in question. Of course it is far more easy to construct along the axes, so four or eight lobed Mokko-forms are common (this applies to motif construction, too). However, there are many other shapes also in uneven numbers. At least they are rare but not uncommon. Your piece consists out of seven zones which seem not to be in the same size. So the artist must have used his visual judgement in the fan layout. I’m not sure if the artists have been able to calculate angels at all. IMHO constructions in an uneven number could be evidence of a more sophisticated - or a more creative - artist.

Sorry, can't see any flood. On the Fuchi is a bridge over a stream depicted, on the Kashira foliage with glimpses of a roof and torii.

Not necessarily. Actually seven is a lucky number and many groups of seven are known, i.e. seven gods of good fortune, seven virtues, seven autumn plants (nanakusa) etc. There are many Tsuba with a composition made of seven like this: Sometimes the whole number out of seven is distributed on both sides.

I used fine paint brushes serrating the upper tips off. Not bamboo, but it worked as well.

Rather strange. At first I thought of a bonsai tree - but without a bowl? Is there something on the reverse wich could clearify the motif?