Official Seals Act Article 4

The dimensions of official seals shall be in accordance with the attached table. Seals not specified in the attached table shall have the same dimensions as official seals used by agencies at the equivalent level.Dimensions of Official Seals (with figures attached).pdf
中文原文 印信條例第4條
印信之尺度依附表之規定;附表所未規定者,比照相當機關印信之尺度。

English translation for reference only; the Chinese text prevails. Not legal advice.