The only variants in the dates mentioned that I am aware of at present are as follows:
Four for 1911. Both Obverses and both Reverses intermixed. (Gouby A&a, A&b, B&a, and B&b).
Two for 1912, listed on Michael Gouby's website as 2 date spacings:
Date A "Centre of 2 to bead, 10 beads"
Date B "Centre of 2 to gap, 9 1/2 beads"
Re: 1925, I am aware of only the two listed in Freeman, F-404 (1& A, Gouby B & A), and F-405 (2 & B, Gouby C & B).