Gizeh 1924 <> Cairo 1928 and after

See the end of Sura 73 in the Gizeh 1924 print (on the left)

and Cairo 1928 (on the right, slightly enlarged -- the Cairo print is a bit smaller and has much less margin).
First line  الن and ان لن
In 1952 it's back to الن

The Bairut (Paris, Amman) reprints oscillate between the two.
The original Damascus ʿUṯmān Ṭaha has   one word:

So has the first Saudi reprint:

But the next, the first done in the new printing complex, has two: