Nope, I'd never heard of it either, but I need a stock size bullseye window, and I've traced some down with a diameter of 595mm, inc bead, for £50 + VAT delivered, which seems a pretty good price. They tell me that Kembang Semangkok, or KSK for short, is an oak substitute and I've done a bit of Googling and it seems kosher. I'll be staining it to match iroko windows treated with light oak Sikkens. Anyone come across this stuff before?