Hi,
It looks 'original', I just Googled Star Trek Journey to Babel
and found:
IMDb
Star Trek: Season 2, Episode 10
Journey to Babel (17 Nov. 1967)
Which does not seem to fit with the date on the script 'received Sept 19th 1973' ..... Most odd
Unless it was received by someone other than the cast on that date/year
?
I found this webpage which not only gives a synopsis for that particular episode, but a lot of the dialogue as well, so you could compare. Could be the Title on your script was a working title not used in the final show?
http://en.memory-alpha.org/wiki/Journey_to_Babel_%28episode%29There are an awful lot of Star Trekkers (or whatever they are called) out there who would love an original script that may have been handled by Kirk, or Spock!!