Can someonne help me to decipher this unusual seal ? Many thanks
Side carving of this seal
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The characters are
which would be expressed today as 「令憲稽首」. This roughly translates to prostrate before the law.
What you have there looks like a seal recorded to be carved by an artisan named 黄士陵. See http://www.ne.jp/asahi/yoshitaka/hanko/kousiryou.html:
The side says
In imitation of bronze inscriptions, by 士陵
referring to the script style of the seal being bronze inscription shapes.