Iron tsuba of round form decorated with design of moon, stars, cloud, snowflake, gorintō, and Genji-mon in negative openwork (in-sukashi). Raised tubular rim (dote-mimi). Deep black patina, traces of lacquer. Naka-daka type of plate (thicker in center, getting thiner towards the rim). Visible gap between the rim and the plate. Dimensions: Height: 91.7 mm; Width: 90.8 mm; Thickness at seppa-dai: 2.5 mm, plate before rim: 2.2 mm, of the rim: 5.6 mm. At least Mid Muromachi period, 15th century, but possibly earlier. In 'Silver Book', commenting tsuba №34 Sasano writes: "The technique used to create the rim is the same used for the peak (koshimaki) of helmets (kabuto) during the Kamakura and Nanbokucho periods." On the other hand, the abundance of sukashi elements points towards later times, perhaps late Muromachi or even Momoyama period. "Gorintō is a grave stone composed of five pieces, piled on one the other, representing, from the bottom upward, earth, water, fire, wind, and heaven, respectively" [Nihon Tō Kōza, Volume VI, Part 1.  AFU, 1993, p. 6. / LIB-1554]. A romantic description of the piece may look like this: The air is scented (incense symbol); it's a graveyard, marked by gorintō; a winter (snowflake) evening or night (moon, stars); mist is rising from a ravine towards moon. I did not manage to find a katchūshi piece of this design, only a few Kamakura-bori tsuba:   While the upper tsuba is dated the end of Muromachi, the lower is attributed to the 17th century - Momoyama or early Edo period, though the author put this attribution under question. Deciphering of the strangely shaped opening to the left of nakago-ana is sometimes "a conventional scroll", and sometimes - a fern or bracken. I think mine is a cloud or mist, but I don't have any material evidence to prove this understanding, and I came to a conclusion based only on context. It may easily be dinosaurs playing ball. The fact that this thing always accompanies the Genji-mon, or incense symbol, it may be a scent itself.

Iron tsuba of round form with two ebi (lobster) on omote (obverse side) and shika (deer) among scattered momiji (maple leaves) on ura (reverse side) motif in brass takabori (high relief) suemon-zōgan. Traces of lacquer. Unsigned. Late Muromachi / Momoyama period (late 16th / Early 17th century). Dimensions: 69.0.6 mm (H) x 69.6 mm (W) x 3.4 mm (T, seppa-dai). Weight: 92.6 g. Illustrated at: The Lundgren Collection of Japanese Swords, Sword Fittings and A Group of Miochin School Metalwork. Christie's Auction: Tuesday, 18 November 1997, London. Sales "GOTO-5881". Christie's, 1997. - #2 at page 7. Provenance: The second John Harding; The Lundgren Collection. Description at Christie's: "The iron plate depicting two lobsters in takabory and brass takazogan, the reverse similarly decorated with deer among scattered maple leaves, square mimi, late Muromachi / early Momoyama period (late 16th/early 17th century) Diameter 68 mm, mimi thickness 4 mm. Provenance: The second John Harding." Also at: JAPANESE SWORD-FITTINGS & METALWORK IN THE LUNDGREN COLLECTION. Published by Otsuka Kogeisha, Tokyo 1992. № 134. Description on page 173: Sword guard with design of shrimps in inlay (scarlet [sic] maple leaves and deer on the reverse side). Unsigned. Heianjō inlay school. Vertical 6.85 cm, horizontal 6.90 cm, Th. of rim 0.40 cm. Iron. Taka-bori relief and brass inlay. Momoyama period, 16th - 17th century. According to Merrily Baird, maple leaves, especially if paired with the deer, allude to autumnal tradition of Japanese aristocracy of viewing the seasonal changes of color in the Nara area. The lobster is typical Japanese ebi, - it lacks prominent claws, and has a spiny shell. As a symbol of longevity and good fortune, lobster is a staple of New Year's decoration.

Iron tsuba of round form pierced with design of paulownia (kiri) in a circle in positive silhouette (ji-sukashi), details carved in low relief (sukidashi-bori). Hitsu-ana were cut later and then both plugged with lead or pewter. Brown patina. The most unusual characteristic of this tsuba is its 'positiveness': the absolute majority of Kamakura-bori tsuba are of ko-sukashi type, i.e. with small openings, presenting the motif in negative silhouette. Kamakura-bori school. Muromachi period (ca. 1450). Size: Height: 85.1 mm, width: 84.8 mm, thickness at seppa-dai: 3.2 mm, at rim: 2.8 mm. Weight: 79.1 g. A similar tsuba is presented at Japanese Swords and Sword Fittings from the Collection of Dr. Walter Ames Compton. Part I. Christie's, New York, March 31, 1992, page 11, №3: "A Kamakura-bori tsuba. Muromachi period, ca. 1450. The round iron plate is pierced with an openwork design of a paulownia crest (kiri-mon), the surface details of which are carved in low relief. The design is repeated on the reverse. The edge is slightly raised  and the rim has some iron bones. 78 mm x 77 mm x 3.5 mm. Hakogaki by Sato Kanzan, dated summer 1973."

A very large and very thin iron tsuba of round form decorated with design of formalized butterfly and dragonfly in openwork (sukashi). The characteristics of the plate resemble those of Kamakura period ko-tōshō tsuba. However, the design seems too 'modern' to me, but it's hard to tell; it may be a late Muromachi or Momoyama period work. Tōshō or Ko-Tōshō school (or a Katchushi). Muromachi period. However, Boris Markhasin and Skip Holbrook insist this is a 20th-century machine-made tsuba. Dimensions: 99.6 x 100.5 x 2.1 mm. This is what Jim Gilbert says about old tsuba:

"Traditionally the old iron plate tsuba are classified into Ko Tosho (old sword smith), and Ko Katchushi (old armor maker) styles. It is sometimes difficult to justify attribution of a given tsuba to the Tosho or Katchushi category. Generally guards with raised rims or relatively complex designs tend to be assigned to Katchushi. This is basically a convention we follow out of habit and convenience." [...] "In Token Kai-Shi part six, Articles by Akiyama Kyusaku, Robert Haynes comments: "…from 1300 to 1400 over 150,000 MOUNTED swords were made in Japan for export alone. This means that over four tsuba a day were made for 100 years. This would mean that at least 3000 persons were making nothing but tsuba, let alone all the other fittings needed to complete these swords. With sword smiths, fittings makers and all the other artists need to complete a sword for export, at least 10,000 sword artists were working together, in any one of these hundred years."

Another tsuba of similar design, Tōshō school, is illustrated in this collection; see TSU-0319.2015. Reference to this design can be found in LIB-1359.2017 Japanese Swords and Tsuba from the Professor A. Z. Freeman and the Phyllis Sharpe Memorial collections, Sotheby's, London, Thursday 10 April 1997; p. 18-19, lot № 37: "A Kamakura-bori Tsuba, Momoyama Period. ...pierced with two large formalised butterflies..."  

Circular form tsuba made by a mirror-maker, i.e. kagamishi. Cast yamagane plate with design of six persimmons on their peduncles surrounded by leaves. Slightly raised rounded square rim. Hitsu-ana is brutally cut later in time. Copper sekigane. Early Muromachi period (1393-1457) or earlier. The inscription on the box reads: "Kamakura or Muromachi Period. Yamagane Tsuba". Dimensions: 81.9 x 81.6 mm; thickness at seppa-dai 2.8 - 3.0 mm, rim 3.4 mm.

Iron tsuba of oval form decorated with design of jakago (bamboo lattice work) in openwork (sukashi). Copper sekigane.

Unsigned. Edo period.

Size: 73.7 x 70.3 x 5.6 mm.

Note regarding design: though some might think that this piece belonged to a member of the lost tribe of Israel, it did not. Jakago baskets were made of bamboo, filled with rocks and used to catch crabs (besides other uses).