Six-Gun Western Library #7

 

The front cover image on Page Publications' Six-Gun Western Library #7 is from the splash page of His Father's Son!:

His Father's Son! originally appeared in Marvel's Two-Gun Kid #6, September 1956, with art by Matt Baker. This story was reprinted in Australia in Horwitz's Giant Western Gunfighters #1, November 1961.

Six-Gun Western Library #7 is an oft-recycled Yaffa issue. It was originally published as Six-Gun Western Library #1, c.November 1971, and subsequently recycled as Six-Gun Western Library #4, Blazing Western Stories #4 and Western Illustrated Stories #6. 

There may be more editions of this issue but I think this is the final one published.