The LMG-25 was designed by Adolph Furrer at Waffenfabrik Bern in the 1920s. Furrer was a devoted fan of the toggle locking system, and also designed a toggle-locked submachine gun that Switzerland (unwisely) adopted in 1941. The LMG-25 was first produced in 1924, adopted in 1925, and remained in production until 1946 with a total of 23,045 standard models and 1,742 optics-equipped fortress models made.
It is chambered for the standard 7.5x55mm Swiss cartridge with a 30-round side-mounted magazine (interchangeable with the later Stgw 57 magazine, incidentally). It is an effective design, if expensive to produce, and served Switzerland well for several decades.
Talk about “Built like a Swiss watch!” The fit and polish of the interior parts just isn’t seen these days.
I am reminded that the more complicated a Swiss watch is, the better. It means it can be sold for more money. That obviously carried over into small arms.
“(…)fan of the toggle locking system, and also designed a toggle-locked submachine gun(…)”
He was also able to upscale said design to create 24 mm Tankbüchse 41 https://guns.fandom.com/wiki/24_mm_Tankb%C3%BCchse_41 and 34 mm Flab Kan 38 https://militaerfahrzeuge.ch/unterkategorie_26_34_398.html