Photos from museum of Tabor. Czechia

[Matchlock]

Thank you, Spiridonov,

Actually, the first photo was taken at the Koninklijk Museum van het Leger en de Krijgsgeschiedenis, Brussels.
The three wrought iron tiller stock haquebuts/stick guns range among the earliest of their kind and were made in ca. 1430-50.

The second photo shows two Czech 'Hussite pipes', short round wrought iron socket guns of ca. 1430, the stick stocks are replacements. The barrels are about 40 cm long, with relatively small bores of ca. 16 mm. Note the characteristically small touch hole.

The bottom photo depicts a cast copper alloy haquebut barrel made at Nuremberg, about the earliest of its kind as the staging and the early form of the hook placed nearby the muzzle denote: ca. 1450-60.
Length 73,8 cm, cal. 19 mm. The tiller stock is missing from the unusually narrow socket. On first sight one tends to believe that a small portion of the stick stock has survived but the more detailed photos in one of the following posts clearly show that this not the case.
Of course, this heavy 'brass' or 'bronze' piece was not a handgun but was counted among light artillery.

I attach better quality scans of the Czech guns.

Michael