Jacque Lecotier wrote:
For those interested, UNA LUZ EN LA VENTANA was shown in the US in 1947, via a "Star Film Corp.", according to the New York State Censors' Archives. I assume it was in Spanish only.
In addition to this discovery (and I have to say, I'm surprised to learn the film reached the US at all), it's also worth mentioning that, while searching for any press material on Rondo Hatton from 1930 to 1944, I also looked for material on acromegaly in the daily press during the same period, and came up with over 430 articles, including numerous lengthy pieces on wrestler The French Angel [link] and on Mary Ann Bevan, who was exhibited for years at Coney Island as 'the world's ugliest woman' [link].

This seems to suggest that acromegaly was relatively well-known as a potential source of disfigurement during the period, and that the Argentinian movie may not necessarily have been a direct influence on THE MONSTER MAKER; which isn't to dismiss the possibility entirely, merely to suggest that acromegaly already had some general 'currency' anyway.
CreepingBride wrote:
...ok, so what horror movie parts did Rondo play without make-up before 25 July 1939? Or is that "Ripley's BoN" column simply the wishful thinking of a movie agent's publicity plant?
The Ripley piece seems to coincide with the filming of THE HUNCHBACK OF NOTRE DAME, possibly the sole reference point for the 'horror parts without make-up' claim, being played up for potential publicity here imho. Because I can't believe we wouldn't have noticed Rondo in other 1930s horror flicks with which we're all incredibly familiar.