A native speaker of Japanese has asked if ゴールデンウィーク is wasei eigo. The Wikipedia article on Golden Week in Japan claims that the term was created in 1951. However, a google ngram search for English ...
While visiting Tokyo, I noticed that most levels were indicated by B2F, B1F, 1F, 2F, ... . This doesn't look like the Romaji for -kai or -gai counter-words, which I assume would be chika ni-kai, ...