I looked up Tye 240.5 in my Tye's Jitals
. First, yours does match exactly the pictured Tye 240.5 in the book. It is from the mint
at Qunduz. In short, here is Tye's explanation, on page 68, about this issue -
"The broad fabric
and new weight standard
of the late Qunduz coins 240
& 243 represent the most complex single transformation seen in the whole jital series. The coins are closely linked to the most important jital currencies of the time by their designs, but they are not jitals at all by their weight
or shape, which derive from a completely different Central Asian coinage tradition. ... That issue, called the 'ghidrifi', was likewise a base billion 4.0 to 4.5 gram coin. The historian Narshakhi clearly indicated that the ghidrifi was a fiduciary coin..."
that was helpful. But it may have just raised more questions.
Tye gives as:
as-sultan al-a/'zam 'Ala/ud-duniya wa ud-din
Which probably roughly translates as something like "The great Sultan
Ala-ud-din" But I'm not sure about the correct form of the name and what the rest may mean. Maybe someone else can correct me.