Authentic Siemens E88CC?

Is this tube an authentic Siemens E88CC? No gold pins and the shield is flat. No 'Made in West Germany', plus they came in white boxes.
To be honest the way the getter is "attached", the plate itself, the font on "Siemens", and the "quality" of the screening leads me to suspect them fake. Could be wrogn, of course.
It's real Siemens from ~70's, but not the highest quality version.