There probably are two different versions/editions of the 1950 edition New World Translation of the Christian Greek Scriptures (but with the earliest edition published for only a very brief period of time). I think that because of the following. I have one which on the copyright page says "COPYRIGHT, 1950" without saying what edition (such as First, Second, Revised, 1951, etc.) it is and without mentioning what printing it is. In that one the Appendix on page 786 has paragraphs saying that 1 John 5:7, 8 contain spurious wording. The 1951 revised edition also says that in the Appendix. But at one time I saw (and I think I once owned) a 1950 edition which did not have that content about 1 John 5:7, 8 in the Appendix. I thus think there were two 1950 editions. There was also an edition prior to 1951 which said "Second Edition". For example the 1951 WT book called "What Has Religion Done for Mankind?" in its list of Bible translations used says regarding the New World Translation of the Christian Greek Scriptures, that it quotes in the book, that it is the "2nd edition". I noticed that some of the quotes from that 2nd edition have different wording than that used in the 1951 revised edition and different from my copy of the 1950 edition.
The 1963 compilation edition of the 6 volumes used the 1951 revised edition. But their are some differences from that 1963 edition in comparison with the prior individual six volume. I noticed that many of the maps from those volumes were excluded in the compilation edition (which page 608 of the Proclaimers book says was a "special students' edition") and there were some other differences. But a number of the WT books (such as the "Life Everlasting" book) which in the back advertised the compilation edition inaccurately said that edition (which was called the "Large-Print" edition) "contains the original edition of the" NWT.
The 1942 WT KJV (I think my copy is the 1942 edition but it doesn't say "1942" on the title page or copyright page) besides having the scripture text, chapter summaries, cross references, and marginal notes of a Holman edition of the KJV also contains WT specific content. The page prior to the contents page is headed "Important Explanation" and one thing it mentions is 'JEHOVAH: Wherever the words "GOD" and "LORD" occur in all capital letters, the name in the original Hebrew is Jehovah".' In the back there is a section called "God's Word on Vital Subjects" which has a list of quotes of scripture texts (including from non-KJV translations) pertaining to WT doctrines and practices, such as "Ordination", "Commission to Preach", and "Manner of Preaching". After that section are 4 maps prepared by the WT.
The WT's ASV has a Concordance which was prepared by the WT (the Proclaimers book says it was prepared by the WT). The Proclaimers book says that the WT ASV was the first to include a concordance to the ASV, but that claim of the WT is false. I have more than one copy of a "Teacher's Edition" (one which includes scripture cross-references, unlike the one published by the WT) of the ASV published by Thomas Nelson & Sons. That edition has a Bible encyclopedia/dictionary and a concordance of the ASV (American Revised Bible, Standard Edition) along with it and its concordance has more than twice as many pages as the WT's. That concordance by Thomas Nelson says "Copyright, 1900, By Thomas Nelson & Sons" and thus clearly was published long before the WT, thus the WT's was not the first. The WT's printed edition of the ASV includes 4 maps prepared by the WT.
The KJV, ASV, and Byington Bible included on the WT's online library
seems to exclude all of the alternate readings, all of the alternate
renderings, and all of the footnotes/end notes of the WT's print
editions of those Bibles.
,
or YHWH), from the first book to the last. This name, symbolized by
these four Hebrew consonants, occurs, all together, 6,823 times* in the
Hebrew Scriptures. The Hebrew Scriptures were first translated into
Greek about 285-247 B.C.; but some time before that the Hebrews began to
leave off pronouncing the name, out of a superstitious fear of taking
it in vain. Hence whenever they read and came to the name, they
pronounced instead the word Adonai (Lord) or Elohim (God). Hence in making that first translation into Greek known as the Septuagint Version (LXX) the translators followed the Hebrew custom and translated the above substitutes for God's name into their Greek version.