This is a firm based in Luby, Czech Republic, more famous for its Violins and Classical Guitars. 

Its foundation comes during the period of communism and the collectivisation that occurred under the name of Cremona, but it likes to put its origins way back further to the long history of instrument making in the region and the foundation of the Luby School of Violin making in 1873. The reality is Cremona opened a new factory in 1967 that was called Cremona Strundal and with the fall of Communism this became Strunal. It is quite a major concern still, employing around 100 people and making a variety of stringed instruments. 

It doesn't mention making Ukuleles anywhere on its main website, they do appear on the US one with two Concert models the Hoku and the Lono and I know it makes the Bohemia range of Ukuleles for Thomann, (both models can be found re branded on their site along with the cutaway Kapua), and possibly does some OEM for other firms too. It also makes a number of 1/4 size classical Guitars with a 440mm (17.3 in) scale that can be restrung as Guitarleles.