So far as I can see from the images of both pieces, this is silver leaf. I use a lot of it and have been doing so for years. A number of factors lead to discolouration. As Sue correctly says there is sometimes a reaction between the hot glass and the silver which turns the silver yellow or gold. Also if the silver is overheated in the glory hole it can oxidise and then reduce back into a lustrous effect, particularly with some colours. However, most of the time the sort of discolouration as seen in these images is a result of age - some people call it tarnishing, but I prefer patination. Be very careful if you try to clean it, as the leaf is microns thick and you will wear the silver away.
Gold leaf, as used by glassmakers, is almost always between 22 and 24ct gold. It is much more expensive, much more delicate and thinner considerably more is needed to get an equivalent coverage. As a general rule, gold leaf will look like much more gold than you can see in these images.
I don't remember Charlie Meaker using silver leaf, but he may have done. However, he was quite particular about signing his work. This isn't a shape that I would normally associate with him, but it doesn't mean that it couldn't be his. I knew him well in the eighties and then when he moved to Denmark we lost touch. He was a wonderful chap and it was good to run into him in Frankfurt at Ambiente around 2004. His son Erik became a glassmaker
http://www.erikmeaker.com/ and does very interesting work as well as teaching in Denmark.