This Magazine is Haunted #19 in Ghosts and Ghouls #6

Charlton's This Magazine is Haunted #19 was published c.August 1954 and contains the following comics features:

Where Do They Lurk?

Final Payment

Friendship Beyond Death

Doom of the Cheat!

The Coffin Maker!

The Ghost of Port Palos

All of these features - apart from Doom of the Cheat! - were reprinted in Gredown's Ghosts and Ghouls #6:

I believe Ghosts and Ghouls #6 was published late 1978.

The Coffin Maker can also be found in Gredown's Shriek of Despair. I expect to find the other stories in this issue to have also been recycled in subsequent Gredown issues. 

Oh - if you're chasing a reprint of Doom of the Cheat! it can be found in Gredown's This Comic is Haunted #3, another fulsome repository of This Magazine is Haunted material