Africa/Luanda

IANA time zone database
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http://mm.icann.org/pipermail/tz/2014-August/021344.html

Zone Africa/Luanda 0:52:56 - LMT 1892
0:52:04 - AOT 1911 May 26 # Angola Time
1:00 - WAT

...

With the Portuguese law linked:
http://dre.pt/pdf1sdip/1911/05/12500/23132313.pdf

I'd suggest that the data should be changed from 1911 May 26 to 1
January 1912, but I don't have much Portuguese language expertise to
confirm this...

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It seems to be a decree [en nome da Republica se decretou], not law, and it doesn't mention AOT nor WAT.