comparison between two printing methods on 75p stamp of same <a href="https://en.wikipedia.org/wiki/Machin_series" class="extiw" title="w:Machin series">Machin series</a> design as issued in 1967 just a different denomination
<a href="https://en.wikipedia.org/wiki/General_Post_Office" class="extiw" title="w:General Post Office">General Post Office</a>
<span class="int-own-work" lang="en">Own work</span> scan by <a href="//commons.wikimedia.org/w/index.php?title=User:Robin_BOITARD&amp;action=edit&amp;redlink=1" class="new" title="User:Robin BOITARD (page does not exist)">Robin BOITARD</a>