Notice the different ways these three versions translated the Greek word, "καὶ".
I've bolded the word as it is used in the different versions.
When I saw Him, I fell at His feet like a dead man. And He placed His right hand on me, saying, “Do not be afraid; I am the first and the last,
and the living One; and I was dead, and behold, I am alive forevermore, and I have the keys of death and of Hades.
“Therefore write the things which you have seen, and the things which are, and the things which will take place after these things.
Revelation 1:17-19 NASB95
And when I saw him, I fell at his feet as dead. And he laid his right hand upon me, saying unto me, Fear not; I am the first and the last:
I am he that liveth, and was dead; and behold, I am alive for evermore, Amen; and have the keys of hell and of death.
Write the things which thou hast seen, and the things which are, and the things which shall be hereafter;
Revelation 1:17-19 AV 1873
When I saw him, I fell at his feet as though dead. Then he placed his right hand on me and said: “Do not be afraid. I am the First and the Last.
I am the Living One; I was dead, and now look, I am alive for ever and ever! And I hold the keys of death and Hades.
“Write, therefore, what you have seen: both what is now and what will take place later.
Revelation 1:17-19 TNIV
The word "καὶ" is found 9 times in the [NA27] Greek text shown above [10 times in the Hodges/Farstad Majority text]
The NAS consistantly translated the word as "and" all nine times.
The KJV also translates it as "and" seven times but also translates it with a colon twice in verse 18.
The TNIV follows the KJV in verse 18 but employs a colon in verse 19 too.
If I remember correctly "καὶ" is frequently untranslated in the gospel of Mark.
In the BAGD Lexicon [391-393] there is a rather lengthy discussion of the words different uses which contribute "greatly to the distictive coloring of the NT style"
Rob