Where are rugby balls made?

2004 IRB Law 2 states:

The ball must be oval and made of four panels.

Length in line 280 - 300 millimeters

Circumference (end to end) 740 - 770 millimeters

Circumference (in width) 580 - 620 millimeters

Material: Leather or suitable synthetic material. It may be treated to make it water resistant and easier to grip.

Weight: 410 - 460 grams

Air pressure at start of play: 65.71-68.75 kilopascals, or 0.67-0.70 kilograms per square centimeter, or 9.5-10.0 lbs per square inch. The ball is stitched together so that the 4 panels are joined. On the top of the large circumference a small hole is allowed where the inner "bladder" is pushed and then the valve is glued in to the bladder. The ball is then stitched around the valve and inflated to hold the shape. The ball is coated with a poly resin to protect the leather and make it last longer under the pressure of kicking. Once the resin is dry the ball can be inflated using the valve.