Hello Mike,
Although I am more of a painter/modeller of miniature/toy soldiers I appreciate and have bought a number of pre-painted figures. It is also great seeing examples of soldiers from an earlier period, as you have been doing with the Haffner figures.
I am not knowledgeable about the Haffner catalogue however I know something about Kaiserzeit uniforms, so please see my comments below:-
I do not think the figures listed as 1st Royal Saxony Uhlan Regiment Nr. 17. are either Saxon or ulans. The Kingdom of Saxony's Ulan regiment numbered 17 in the German system, its full title being:- Ulanen Regiment (Kaiser Fran Josef von Österreich , König von Ungarn) No. 17 wore a very different uniform e.g. lance caps/ Tschapskas and the tunic was the Ulanka. This regiment's facings were also crimson with brass buttons. The Saxon pennons for troopers was also white over green
Many German cavalrymen were issued with a lance, this led to a great deal of misreporting about Ulans being seen, in the early stages of WW1. The image of the Wappen on the helmet would need be clearer but I think the figures are Württemberg dragoons. This regiment had lemon yellow facings and the lance pennons for the troopers of that state was black over red.
My main reference in writing this message has been R. J. Marrion's Lancers and Dragoons, Uniforms of the Imperial German Cavalry 1900 - 1914 pub by Almark Publishing.
Yours Aye,
Douglas aka Blackbob