I’ve got a panel of 10mm plywood in the aft cabin of our Westerly Sealord that I’ve got to replace. When I measure the thickness it appears to come up as 10mm. The only thicknesses I can see available are 9mm or 12mm. It’s teak faced ply.

Did Westerly use 9mm ply and add a teak face? Was 10mm available in 1986?

Any suggestions for suppliers apart from Robbins?