I found the following:
HCO BULLETIN OF 1 DECEMBER 1978:
PROGRAMMING THE DIANETIC CLEAR FOR HIS NEXT STEP
2. If a Dianetic Clear was incomplete on Grades 0-IV prior to the Dianetic Clear attest (i.e. mid-grades), you would complete the unrun grades (Quad or Expanded) through to Grade IV (omitting the R3RA steps on Service Facs).
If a pc goes Clear on a grade then you can give him the other grades, but you’d end off that grade and not continue it.
(That implies you could go Clear on a grade.)
HCO BULLETIN OF 5 MARCH 197R, REVISED 6 MARCH 1979:
DIANETIC CLEAR FALSE DECLARES
Technically, a very few thetans have never been anything but Clear. These few didn’t “go Clear” on anything; they have simply always been Clear. When a natural Clear is found it should be so stated. To assign this condition to some other practice is a suppression of Dianetics and Scientology.
(Says you could be clear even if you never had any auditing.)
HCO BULLETIN OF 14 DECEMBER 1981:
THE STATE OF CLEAR
A CLEAR IS A BEING WHO NO LONGER HAS HIS OWN REACTIVE MIND. The only exception, very, very, very rare, is one who didn’t have a reactive mind in the first place.
...
Scientology lower grades sometimes exteriorize a person but to date, to my knowledge, have never produced a Clear: That was not their purpose.
Mentions Natural Clear again (very, very, very rare). So maybe you were clear to begin with? Says to LRH's knowledge grades do not produce a Clear, but doesn't say it's impossible.
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