csmss: Neither is laminated, and I haven't seen any Yugo SKS as such. One of these SKS has the blackish thick grain alternating with somewhat reddish brown wood, often seen on many Yugos.
The other has wood almost identical with many Yugo Mausers (my 48A).
mehavey: I had forgotten the context of your warning about cosmo, that it is only in regard to guns remaining in hot conditions. Glad that I re-read it.
At SKSboards, there is plenty of info about cosmo removal methods on "Stickies" etc.
Maybe people just get tired of their skin being exposed to a petroleum product, or rubbed on their shirts in hot weather? There could be benefits to allowing a young lady to operate such a rifle....in very warm weather