Wow! Some very nice helmets Karel! Not sure how I missed this thread.
I have 2 observations though.
The first concerns your JzP helmet. It looks like an issued EM helmet with the exception of the spike and the leather underlay of the front visor.
I believe the spike to be incorrect as it's a correct officer's model. I can't see this as a Senior NCO's model as it doesn't have any of the of the other officer features that would be found on a NCO helmet such as the voided crown on the wappen or officer style screw post chinscale mounts.
Here are some foto's of my private purchase NCO parade JzP, albeit it needs some work.
Note the smooth EM style spike but voided crown.
As for you wonderful private purchase 10th Hussars busby, I have indeed seen those style chinscale mounts. If you folks recall Kube's auction no too long ago, I don't recall the date off hand, they had a cork/ersatz Dragoner's officer's model that had the same chinscale fabric covered mounts.
I have this feeling your busby was made and sold to be used with a field cover. I recall seeing but I can't remember where a foto of a officer wearing a busby with a field cover but it seemed to me that only had the mount rossette's exposed and the chinscales tucked underneath the cover.
In any event, fantastic helmets!
John