I don't know the magazine - but wouldn't mind having my own copy! Here's a thread from the US "Gateway to Airguns" (GTA) forum. Excellent photos of the sights and more linked in the initial post; some repeated if you scroll down.
https://www.gatewaytoairguns.org/GTA...topic=150525.0
I may be mis-remembering, but the standard 50 T01 had the very nice Diana fully click-adjustable rear sight of the day, and I have a vague notion some examples of the "military" version did too.
This sight is on a pre-war Diana model 45 underlever; the sight on the 50 looks quite similar!
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