Hello Ed, you are probably right about the two CV marked ones beeing Swiss. According to Walter's The Luger Book the letters stands for "Chrom-Nickel-Stahl", used in Swiss Bern lugers.
The bottom is also probably Erfurt, but the logo is so darn close to Kongsberg Våpenfabrikk. I recently found out that they produced ejectors trough some blueprints.. but I have never seen one
