I have emailed the Mark Cross company and they are unable to give me any information.
They are in a brown leather case stamped with DUNLOP on the front. Inside are 4 metal cups. Inside those is a smaller brown leather case, this time holding 3. On the inside of the top flap, just below the fastener is the fairly worn Mark Cross England logo. The cases and cups appear to be slightly different, so I am unsure if the belong together.
I have a list of very poor quality photos that will hopefully help. I am interested in learning when they were made, if they are a set, and what exactly they are made of. Any pointers in the right direction would be greatly appreciated.
Front of big case
Bottom of big case
Inside big case
Big cups
Front of small case
Inside small case
Small cup
Back of small case
Back of big case