Please help to identify this dagger

[Tatyana Dianova]

Almost all unconventional pieces seem to be pretty late, and some of them are simply composite pieces… Anyway, it is interesting to know where the parts or influences come from… Sometimes it is pretty difficult, as it is for example with a Shashka with a cross-guard, which was posted recently by Ariel.
Today I have visited the old castle in Loket, Czech Republik, and at the castle museum I have seen an old yataghan with a recurving blade, which seems to be of European origin
Are there any other ‘ladder’ bolsters around, except Adya Katti???