The clasp part does move in and out and is working but is a little loose. If you wanted to use this as a clasp or even use as a pendant I feel that it would be beneficial to have a jeweller to make the connection tighter and more secure, I wouldn't trust it as is.
Unmarked - tests as 9ct gold. In fair vintage condition. The plain gold side has a few scratches and small dings. Please see the photos.
Please pay attention to the written sizes given as the photographs have been taken close up to show detail - which may also make the ring appear bigger than in person