Where to find thread count?

[Paul Henry]

The actual size of the sett is often down to the weaver , while it has to have the correct threadcount (whatever that might be) there are often minor little ajustments the weaver might make to enable the tarten to be woven, sometimes slightly increasing or decreasing large colour areas for example.The threadcount does not indicate what size the finished tartan will be , it is a formula for the design, which means if very fine threads are used such as silk the design will be small, and if very large strands are used a very large pattern and proportionally thicker cloth as well will result. It's usually possible to scale up a threadcount to make a larger sett , something that I've used with DC Dalgliesh many times,
As to why there are differences between the registers I suspect that human error is one reason, whether in the counting of thread of old samples or indeed simple typos might account for quite a lot of the problems