Sergio,
I knew I'd seen the "E" before, this offer is at Simpson's but does not show the "E" very well.
So there are at least two of them.
This one is 1920 over 1914, with the "E" after the 1920 property marking.
https://simpsonltd.com/erfurt-luger-...te-1920e-1914/
I'll try to grab a picture when I get time.