I finally got it.It's a parade cuirass. It's in very good condition. I looked for the maker's stamp but couldn't find it. I couldn't find any information about the parade cuirass online, it's a specific topic. Can anyone tell us more about the parade cuirass?
Bet this is an private purchase cuirass. So no unit/Kammer (Quartermaster) marks.
Can be seen in the old catalogues.
No Officers cuirasse. These would have the lionheads on the shoulder parts of the back plate. Long gilded lock end-pieces on long shoulder straps.