Straits Settlements issued a long set of definitives during the KGVI era, featuring the King and 2 palm trees as below:
Several values were issued using 2 different dies. For some collectors, identifying the 2 die types is challenging and the images in Scott's Specialized are quite small.
Here are the 2 dies of the same denomination/color combination side-by-side.
Scott mentions that Die 1 was printed in a single pass, while Die 2 was printed in 2 steps with separate head and frame plates. Scott's also mentions differences in the bottom palm fronds, however I have always found it easiest to separate the 2 dies by how the fronds differ in their relationship to the oval around KGVI.
Since Die 1 was printed in 1 step, there are places where the palm fronds connect to the oval. See arrows over Die 1. Die 2 was printed from 2 plates, thus the fronds do not connect with the oval around the King- see the arrows over Die 2. A white line is clearly visible in Die 2 printings and can be seen with minimal magnification, if any.
Knowing how to spot both dies is important for some values of the Straits BMA set as well. While on that topic, for me the BMA set is much more interesting then the basic Straits KGVI set. There are many more printings of the BMA set, with multiple paper and die combinations. And despite the many printings Gibbons lists, there are many more shades that can sorted and collected beyond Gibbons. Accumulating multiple examples of the BMA set will certainly yield much in terms of finding multiple printings to display in your collection. And no need to duplicate the scarce and expensive $5 green and scarlet as it only comes one way!
KGVI, who is a frequent poster in this forum, has a well-illustrated and highly informative page devoted to the BMA issues, which I use as a reference. Note that he documents more than 50 die, paper, and shade combinations! http://www.kgvistamps.com/articles/...MA-1945.html
The design seen in the Straits and BMA sets was also used for definitive sets issued for Malacca and Singapore. Gibbons does not mention Dies 1 and 2 with respect to Malacca, so I've never studied this set.
The Singapore issue has 2 perf variations, 14 and 18, which are easy to see by eye. Numerous values only exist in 1 perf type or the other. Gibbons mentions some interesting info regarding Die 1 and 2 usage in the Singapore set (e.g. single color stamps printed (mostly) from Die 1, and 2 color stamps being Die 2). However none of the Singapore stamps are listed as being issued in both Die types.