This is “soeru” which means “append, add to, increase”.
They are from the “昭和” “showa period” . The “showa” period is from 1926-1989 but these are at least 30 years old.
This is made of iron. Please look at the pictures carefully
It measures 21.3 cm long x 2 cm (the stamp) wide.
For more branding irons click here http://etsy.me/2cF0fg5
fromjapanwithlove.etsy.com (link in bio @futoshijapanese )
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