Yeah -- I think the "e", "a", and maybe "g" were modified ... The slanted crossbar doesn't match any of the other letter forms they use (reference = "empeg car"). The "g" i'm not as confident about, but the shortened "hang-down" on the g looks a little different. The line thickness around the center of the "a" is really tight -- doesn't really match the other forms (compare the circles in the "p" and "g" to that of the "a" -- looks like the circle on the "a" is moved to the right). Interestingly, the line thickness of the crossbar of the "e" is roughly equivalent to the suspect part of the "a" -- maybe further support that they were modified? I'm basing my search off an unslanted "e", the "m","p","c", and "r".

This is the closest I've found so far:

http://www.eff.co.uk/A/P/SpmLR.htm

But it's still not right -- The "g" loops too far under, the holes are too big, and the "c" doesn't curve around enough

Mike