This "Frommer Lilliput" was design by a Hungarian named Rudolph Frommer, a banker who was originally hired as a financial manager to a reknown manufacturer Fegyver- és Gépgyár (often abbreviated as FÉG).
He ended up designing and producing firearms for them instead, all through self education. Many designs of his reached full scale production. Most famously being the "Frommer Stop", this pistol used a long recoil mechanism and was chambered for his version of a more powerful .32acp & .380acp
But this "Frommer Lilliput" is chambered in 6.35mm, which is .25acp. The design is simple blowback, single action, hammer fired. It posseses a grip safety, slide stop, and holds 6 shots in the magazine.