I was looking through the ROC Taiwan Post websitehttps://www.post.gov.tw/post/intern...77&keyword=%
noticed that the printing process for the Tower definitives
was by deep etch offset
and this process included
an engraver apparently
Engraver for offset stamps?
For typography yes but for offset?
Here is the only one I have from that set and it looks
like any other normal single colour litho/offset stamp.