Piecing together guards for Polish saber. There is a lot of guesswork involved due to the solitary, 1830 source. Talking to Russ Mitchell, who pointed out the various Eastern European nations have stylistic differences as well. The system he teaches uses a more squared-up stance and false-edge cuts, Poles seem not to. So here we go.
High Guard, from the 1830 manual
Low Guard, from the 1830 manual
From Angelo's Highland/Hungarian, note the Medium Guard and similarities with the Low and High Guards of 1830.
(And then 6 parries are shown in the 1830 and how they inter-relate with a blade)
Note foot position and how the body is weighted. Note arm in relation to body.
From the film Potop 'The Deluge',- this low guard is used by others in Poland today. No idea if its historical or not, but some of the drills other groups are using start from this low, 'iron door'-like position. Weight shifts forward and back as cuts, feints, and parries are made. Trying to find an image of a historical equivalent.
Late-period, First Guard by Richard Burton. And he doesn't like it or other hanging guards. Here the point is aimed at the chest, but has trouble. Arm is exposed, point is dipping and so on. Burton doesn't like this guard for saber and said it probably arose from its use in single-stick, where it's more useful. Some groups use a very high 'prime' position, point fixed toward the opponent's face, almost like Italian rapier. Looking for earlier sources saying 'yes' or 'no' to that with the shorter, curved saber.
Note the guard 'Bogen' from Meyer dussack and its similarities to the guard described above, but without the troubles Burton noted. (Image from a great collection on the Meyer Frei Fechter site!)