|image 1: obverse and reverse of the coin|
This is my newly bought Johor tin katun. Notice the yellowish toned this specimen has. Johor tin katuns are so abundant nowadays (if you know where to find them) that you can get them at a very cheap price. But unfortunately, almost all of them were badly circulated. This is due to most of the katuns were discovered buried inside the earth, hence were not well-preserved.
Saran Singh has noted in his book that only major varieties of these Johor tin katuns were shown in his book. I think that this specimen does not belong to any of the them. The closest reference is Group D (Octagonal) Class VII ( Pusat / Dot ) , SS35. But this specimen has one extra features, which is undecipherable inscriptions on both of its obverse and reverse surfaces.