There are several finishes for the 19 set. I have sets with green crinkle, green smooth, brown crinkle and brown smooth. The browns were for most part marked with C/|\.
This also went for the power supply case, variometer and spare valves/parts boxes.
All of mine (9) were made in Canada by the 3 manufacturers.
You might try posting to the 19 set group page at:
http://www.qsl.net/ve3bdb
or email another reflector at:
Wireless-Set-No19@yahoogroups.com
Bruce