Originally posted by Henk69:
In the article the cream dilution is birdwide, not limited to hackle and saddle.
A cream duckwing would have lighter wing triangles.
The article does mention that mahogany and cream don't mix, maybe on the females to a cold chestnut.
Well, on p. 329 Punnett writes "... that not only pullets but cockerels also were produced which were very close to the Brown Leghorn type of plumage." So these would have been pretty dark brown (presumably eb) as the Dark Brown Leghorns below, despite carrying cream. EDIT: Correction: The author just states "Brown Leghorn", not "Dark Brown Leghorn". So did he use Light or Dark ones?
To reiterate the matings, here is a summary:
F1: Brown Leghorn male X Columbia-like cream [from Buff Leghorn X cream F2]
= all golds with non-descript melanic markings
F2: = c.75% golds, c.25% cream
> of cream F2 darkest pullets selected which closely approached general colouration of Brown Leghorn females
> cream F2 males predominantly light, 'a good deal splashed with chestnut and black'
F3: "Splashed" F2 male X cream F2 Brown Leghorn type pullet
= 2 classes:
Female 1) breast colour salmon or nearly full salmon
Female 2) breast colour pale salmon or only salmon tinged
Male 1) as male F2 parent
Male 2) approaching nearly Brown Leghorn
F4 (and following?) "utlimately established a strain with typical Brown Leghorn plumage but on a cream ground instead of on a gold one" where the "hen closely resembles a silver-grey" and the males have the white edging in hackles and black and white rather than black and gold secondaries.
That description of the male would seem to fit Sigi's founder male with the mahogany wing bay.