That's kind of a hard question to answer, because of half year tables. As Brunswick switched from GC1's to 2's, there were a lot of 2's that still had things left over from the 1's. 1's came with Monarch cushions, but some of the early 2's still had Monarch cushions as well, before the Super Speed cushions replaced them. Some of the 1's had adjustable leg levelers, but were actually early model 2's. Late model 1's had floating nut plates, though 1's actually started out with a flat plate screwed to the bottom of the rails. Up in Washington state, I moved and set up a GC3 for a guy, that had GC2 pocket castings and irons, which was before Brunswick switched all the way to the inserts used to mount the GC3 pocket castings. So, to answer your question, GC1's had both, plastic and metal name plates, but I believe they started with metal first, then switched to plastic later, mid way through the production, but don't quote me on that, as I just fix tables, I'm not a historian...LOL
Glen