Welcome, roblin!
In They Stand Together:The Letters of C. S. Lewis to Arthur Greeves (1914-1963) there is a page like that, except the edges are not shown. All of page 396 is a photographic reproduction of a letter of December 24th 1930. It's out of print now, but you can find copy on the used book sites. If it reading the letters themselves you want to read, rather than that specific book, volumes 1 & 2 of the Collected Letters of C. S. Lewis are now in print, with volume 3 due out soon.
Hope this helps.
Selah,
Sven
