The big seal script of character Deed is
The topis character 㓞 (Pinyin Qi4), which means "engrave text on wood". The character is not used long time ago, most dictionaries don't collect it but still exist in many compound characters.The bottom is character Big (Post 76), meaning a big man who is trustable, and responsible person.
People negotiate each other, make agreement, then engrave the agreement on the wood as a document both will follow. It is similar to deed in modern times.
The small seals script of character Deed is
Similar to big seal script.The clerical script of character Deed is
Similar to old scripts.Pinyin of the character is Qi4.