The Stamps Of Kedah On Steiner Pages.

As I've understood things, Kedah SG 68a only exists as a line-perf stamp so that is how I've identified them. KGVI's example is line perf, and his SG68 is comb.

KGVI- please correct me if I am incorrect about this.

Not using SG

This is my interpretation
1912 all comb perf.
late printings of the 5c and 8c were line perf. (the 8c has a darker blue)

1938 1c Diell is line perf.

Std Catalogue of Malaysia-Singapore-Brunei
22nd ed
1997
So, yes, I think you are correct.

Postmarks found on Kedah Postage Stamps.


1986 Malaysia~Kedah Steiner Page 9.
These stamps have 6 differing Perforation Guages
and a Perf 14 Unwatermarked.

Kedah SG 68a is a line perf, but my SG Catalogue does not indicate the perf description. The Commonwealth Catalogue which was published by Murray Payne before they were sold to Stanley Gibbons does indicate that there were three printings from Plate 2 which can be distinguished by the shape of the 1 - all were line perfs compared to the original issues on Plate 1 which were comb perf. One is Perf 13.75 and the others are Perf 14. There are also two sizes 18.75mm x 22.5mm and 19.25mm x 22.75mm which was caused by printing on damp and later dry paper.
There is sometimes variation in line perfs because it depends on how the rows line up, but usually there is a corner perf that is not lined up with the others. But I agree that the stamp does not appear to be a line perf. The shape of the 1 still looks right as a Plate 2, but I can not blow it up large enough to be totally sure.
The 1941 date is also another clue that it was used in the right time period because Plate 2 dates from 1938. It is an interesting item.

OMNIBUS SERIES
Malay States (Not including Sarawak or Borneo)

Commonwealth Total (Take your Pick)
One SG shows 206 stamps, a more recent shows 102 stamps

Malay States 11 Stamps. Common Design CD312 Coronation.

The Stanley Gibbons Stamp Catalogue Part 1 - British Commonwealth, 2000 edition lists 106 Coronation stamps.
The Stanley Gibbons Commonwealth & British Empire Stamps 1840-1970, 2020 edition also lists 106 Coronation stamps. Those 106 stamps include Coronation stamps from every Commonwealth entity that issued Coronation stamps, not only the actual Omnibus issues.