Palaut Khrau are rare to find, especially when new and from one of Chiang great monks - Phra Ajarn Tau, as they are now rarely made. This one has been edged in silver to make it easy to wear, and is best worn round the neck as the sound is gentle. Some of these get noisy and rule your life but there is the same great forewarning with the gentler pieces. What makes this exceptional is that it is also dedicated to Rahu and his face is on both sides of the split copper metal ball. It's a cool piece.
This type of talisman is believed to have originated in the region of Burma and this one has a great sound as well as the correct feeling, which is important. A Palaut Khrau is a ball of metal that has a ball of special metal inside that consists of a mix of gold, mercury, bronze, lead, steel, and many other metals, depending on the maker (Palaut is the Thai name for Mercury). Having held quite a few, the inside ball has to roll around inside the outside sphere, for the feeling to work properly when the devotee is walking or moving. The action of these is very strong, akin to a strong Takrut and take a few days to get used to.
These items are mostly for protection and have an element of forewarning from the sound they make, which I am sure comes sometimes with no movement of the ball. Old ones are often found in the ground of temples or ancient market areas and they are decidedly odd. Few people make these now, and the old ones can be very expensive depending on the sound it makes and the source.
With the added silver band, this measures a nudge over 1.35".
A superb piece of Lanna magic.