有限公司簽署是否必須要蓋公司橫線圖章

It is generally acceptable for some simple documents chopping on acknowledging of goods delivered. If the documents are more important e.g. purchase order etc, a formal company chop as said by you with the wordings " for and on behalf of “ is required. If the documents need formal binding, a common seal of the company together with the director's signature is required and subject to the approval by the board of directors.

當然係啦. 代公司簽名忘記蓋這章 (For and on behalf of) , 有事時, 簽名人要上身架.