Iron tsuba of round form decorated with eight roundels – circular emblems of flowers and/or family crests (mon) made of cast brass, pierced and chiseled in kebori, and with flat brass inlay (hira-zōgan) of vines or leaves all over the plate. Both hitsu-ana trimmed in brass. Nakago-ana of rectangular form, with copper sekigane. Four positive openwork (ji-sukashi) roundels at 12, 3, 6, and 9 o'clock; and four negative openwork (in-sukashi) roundels with cherry blossom, bellflower, and two variations on suhama theme. Yoshirō school (Kaga-Yoshirō). The Momoyama or early Edo period, late 16th to early 17th century. Size: diameter 81.4 mm, thickness 4.7 mmat seppa-dai, 4.0 mm at rim. Christie's lot description: AN IRON TSUBA; EDO PERIOD (17TH CENTURY). THE DOLPHYN COLLECTION OF SAMURAI ART. The round iron tsuba pierced with roundels of various floral motifs interspersed among scrolling foliage, all inlaid with brass. 8.1 cm. high. Provenance: Pabst Collection (no. 338).

Relatively thick iron tsuba of rounded square form with slightly elevated rim decorated in carving (sukidashi-bori) and yellow brass (shinchū) inlay (suemon-zōgan) with legendary creatures (humans with cow heads) in a pine tree forrest on the face,  and a horned man with a stick hunting a rabbit in the woods on the reverse.  Large hitsu-ana possibly cut off later on. In the beginning of the 20th century such tsuba were usually attributed to Fushimi-Kaga school. This one may be attributed to either Ōnin or to Heianjō. The latter seems most plosible because of the thick web and dull patina. The technique may also be called "shinchū-zōgan". Momoyama or early Edo period. Unsigned. Dimensions: 72.3 x 68.4 x 4.1 mm

An iron tsuba in the shape of a bold or shaved human head in full round. Unsigned. Dimensions: 62.5 x 53.4 x 4.4 mm Iron, in the shape of a Ni O (Nio) head, in full round, the back flat chased as a pine forest. Signed : Miōchin Masatsugu in sosho. №38 in The Naunton Collection, 1912. There are a few tsuba of such design known. SOLD Iron, a severed head. Signed: Takeaki of Kwaiyō. Ex Hawkshaw Collection [Plate VII]. Below written: Takurio, Suruga, 1118; Tamagawa, p. ; Tanaka, p. 168; Tanetora, 1894. №2729 in The Naunton Collection, 1912. Reference to Hawkshaw Collection [Plate VII] happened to be not exact; it is Plate VIII, №236. It is clearly not the Hawkshaw piece (different facial expression, signle hitsu-ana, no plug. Description at Hawkshaw, 1910, reads: Iron, in the shape of a man's head, severed at the neck, the forehead in three wrinkles, the mouth hard-set and drooping, the eyes open, inlaid brass with shakudo pupils. Signed: Shoami; dated second year of Shoho, first month [SV: December 1644 through February 1648].

Iron tsuba of six-lobed (mutsu-mokkō-gata) form, with six wild boar's eye shape (inome) openings (sukashi). Hitsu-ana and the entire perimeter of tsuba have typical for this school raised rim. Lobes are decorated with landscape motifs in low relief carving (sukidashi-bori). On the obverse: A hut under a full moon, Shinto shrine gates (torii) with pines and a full moon, rocks, a large pine tree, and a temple (pagoda) surrounded by rocks and waves. On the reverse: waves, fishing boat, wild gees in flight under full moon, maple, hexagon (tortoiseshell, kikko) with a dot inside and a dot outside (inclusion/exclusion symbol), and chrysanthemum (the last two may be family crests, mon). Kamakura-bori school. Late Muromachi period (1514-1573). Height: 64.2 mm, width: 74.3 mm, Thickness at seppa-dai: 3.2 mm, at rim 2.6 mm. Weight: 62.8 g (light). NBTHK old green certificate №561: Tokubetsu Kicho  - "Extraordinary Work". A look-a-like tsuba can be found at the Compton Collection, part II, pp. 14-15, №17, though his tsuba is more massive (80 x 84 x 4 mm). NBTHK paper says that the motif is Hakkei (八景), i.e. "Eight Views," so several interpretations are possible (the original Chinese ones, Omi Hakkei, etc.).  However, most likely it is the 'Eight views of Omi' (近江八景  - 'Omi Hakkei'). Why the artist selected a 6-lobed form for depicting 8 views remains unclear, and thus we are in our right to raise the question whether the motif is indeed Hakkei. The term Omi hakkei (eight views of Omi) refers to painting or print sets which illustrate life on the shores of Lake Biwa in Omi (now Shiga Prefecture). The model for such paintings came from China, where, from the eleventh century onward, painters had produced eight views of the Hsiao and Hsiang lake areas of Hunan Province. The themes, which follow the original Chinese models, are: geese descending to land, returning fishing boats, clearing rain, a snow-covered evening landscape, the autumn moon, night rain, a temple bell at evening, and the glow of sunset. Japanese artists have also used the eight-theme approach for other parts of country - including cities - and applied it to subject matter other than landscapes. [Merrily Baird. Symbols of Japan. Thematic motifs in art and design. Rizzoli international publications, Inc., 2001, page 308-9]. Japan Encyclopedia by Louis Frédéric also mentions Omi Hakkei as "Eight landscapes of Omi", and states that this theme was often cited in poetry after 1500. It is likely that the tsuba in focus is designed under the influence of the theme popularity in the 16th century. The theme was effectively exploited by prominent ukiyo-e artists Suzuki Harunobu and Utagawa Hiroshige in the 18th and 19th century, respectively. These are the eight scenes of the theme (see Wikipedia):

• Returning sails at Yabase (矢橋の帰帆) - Yabase. Yabase is an old harbour on the east side of the lake. Near the Tokaido, it was used for a shortcut to Otsu by boat.
• Evening glow at Seta (勢多（瀬田）の夕照) - The Chinese Bridge at Seta. The long bridge across the Seta was used by the Tokaido. In the background the "Fuji of Omi", the Mikamiyama. It is just above 400 m, but indeed well visible.
• Autumn moon at Ishiyama (石山の秋月) - Ishiyama Temple. The Ishiyamadera was located on a hillside next to the Seta River. It got his name form the strange rocks on which it is built, partly on supporting beams. A hut at the upper end of the site allows a view of the lake, and the moon.
• Clear breeze at Awazu (粟津の晴嵐) - Awazuhara. Awazu is well known for its pine wood, Awazu-ga-hara.
• Evening bell at Miidera (三井晩鐘) - Mii-dera. Miidera temple was built in the 8th century. Its famous bell is one of the "Three bells of Japan", the other two being those at Byoodo-in, Uji and at Jingoji, Kyoto.
• Evening rain at Karasaki (唐崎の夜雨) - Karasaki Shrine. Karasaki is a small cape with a single large pine tree, a hitsu-matsu.
• Wild geese returning home at Katata (堅田の落雁) - Ukimido. Alighting geese cannot be seen always, however the little temple near Katata in the square hōkyō-style, detached from the lakeside, connected by a bridge. The first part of the name uki is the same as in Ukiyo-e, meaning floating. Midō means temple.
• Evening snow at Hira (比良の暮雪) - Hira Mountains. The Hira mountains on the west side of the lake experience the hard winter, when the winter monsoon brings much snow from the continent.

In any case, as a conservative, I say that it is a landscape motif and a late Muromachi period work, rather than Omi hakkei motif and a mid-Muromachi work.