With a little digging this is what came up.
Apparently there are two major makers, ones production and ones hand made.
Main difference being the production uses plastic handle scales, has a pin under the back spring causing the knives belly to be slightly smaller, colour difference in the back spring and the liner.
Hand made have a wait time of 1~3 months since the current maker can only product around two knives a day, horn scale, no pin under the back spring so the blade has a fuller belly, same colour across the bolster, liner and back spring.