That depends on if you believe the sellers information, I think personally they are meiji period but I think some of these have been produced for an extended period, so age would be a guess. Not helped by Chinese copies of Japanese copies!
The first https://www.bonhams.com/auction/20190/lot/7/a-bakumatsu-shakudo-tsuba-by-seishu-meiji-period/ is described as Bakumatsu [turn of the 20th century]
https://www.bonhams.com/auction/21008/lot/3459/a-shakudo-tsuba-with-mixed-metal-accents-meiji-period/ Meiji [I think it is more modern, junk!]
https://www.catawiki.com/en/c/1261-Japanese-art?epik=dj0yJnU9aFpPRXptbnNkUmtSYmlLTUU4ZWxzYkRZV2tSczhfc2gmcD0wJm49MVV5VXYySHJUa18zRU5sdFdKTUt0ZyZ0PUFBQUFBR2tLOVpB
The Hamano signed one can be seen: https://www.bonhams.com/auction/18980/lot/15/a-bakumatsu-shakudo-tsuba-late-19thearly-20th-century/ Described as Bakumatsu [turn of the 20th century]
However a papered piece which is less convincing and still a copy in my opinion can be found here: https://world-seiyudo.com/product/tu-050320/ described as Edo period