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As promised, here are the Heineken grists. Not that they are particularly exciting.
Lots of pilsner malt, a bit of caramel malt and a touch of kleur mout (coloured malt). I assume that the last is something similar to black malt. I'm quite surprised to see that there was none in the Bok, just a fairly heavy dose of caramel malt.

I'll be honest, the sugar bit is a total guess. I'm not even sure that it's sugar. In the brewing record it's described as "R. s.". From the context, I'm pretty sure that it isn't a malt. The first thought was that it was some sort of unmalted adjunct. But I couldn't think of any grain type that starts with the letter S. I'm assuming that the R stands for "rauw", the Dutch word for raw. I could be totally wrong. If you have any better ideas, let me know.

Not much else to say, really. So I'll just fuck off.

Heineken grists in 1928 - 1929
Year Beer Style pilsner malt kleur mout caramel malt raw sugar
1928 Li Licht Lagerbier 80.00% 20.00%
1928 Do Donker Lagerbier 78.00% 1.00% 1.00% 20.00%
1929 P Pils 82.76% 17.24%
1928 Bayerische M├╝nchener 92.31% 4.81% 2.88%
1928 Bok Bok 90.00% 10.00%
Heineken brewing record held at the Amsterdamse Stadsarchief, document number 834-1753.