Vielleicht hilft das weiter:


Oder hier:

"My Spiratone isn't like the pictured one, I have the older model, which has different look, is native M42, doesn't state "Auto" word in it's name, but:

"1:1.8 f=135mm No.532xxx lens made in Japan SPIRATONE PLURA-COAT By Mitake"

this one has 3 elements in front group (none is cemented) and rear group consists of cemented doublet... seems to be Ernostar with rear element replaced by cemented doublet... something like:
"