Joe, it does look like a period on the Friedrich Keller. I don't have an example to check with but maybe I'll find one this weekend. On both the EKII ans EKI there is a period after the 6. I wonder what Liefergsmeinschaft Scmuckhandwerker (#9) used? Gordon doesn't list this maker in his book on EK's but I think I saw it listed as a maker of EKII's on WAF. Here's the MM #6 on an EKII.
