I had an SK-1000REW (GYUR26SK) and it had a rubber sheet. SK-1000RE (GYUR10SK) didn't. I currently have an SK-8000 and I think it was made only in ANSI and with a different font without text on Shift, Backspace, etc.
It looks like the change to rubber sheet occurred within the production lifetime of the SK-1000REW, as both types seem to exist. Mine cannot be SK-1000RE as it had Windows keys.
It also presumes that Silitek have manufacturing capacity — it's really hard to keep track of which companies do and which do not. Silitek might be like Costar in that they don't actually make keyboards, only design them and co-ordinate other manufacturers, so it may be that this resulted in the different versions from two different factories both making them at the same time (hence the crossover with both types being made at the same time).
I am so confused. Was there a question? Why pix of a bug?
I've been wondering for ages what my old beige Dell keyboard was, as I really liked it, and it died long before I got interested in keyboards. The keyboard I replaced it with (a Cherry G83-6153LPQGB/02) was terrible and renewed my concern about keyboard quality, but it would be a few more years before I would make the breakthrough.
I've got a large collection of photos of animals, especially insects and spiders, and I was filing away a couple of photos under Lepidoptera when I found those two photos of the Dell keyboard, and since the membrane was exposed, I realised that I had a chance of figuring out what it is.
As for why I would bother with such an uninteresting moth, I have no idea. I don't even know what it is.