Hans Larsen was a very successful competitive marksman (World Champion, in fact) and gunsmith in Norway in the late 1800s. He, and later his company, made a wide variety of guns, from revolving rifles and muzzleloaders to cartridge breechloaders and repeating rifles.
Larsen’s target and sporting rifles were quite popular in Norway until the adoption of the Krag-Jorgensen (against which Larsen unsuccessfully competed for Norwegian military contracts). As the new Krag took over the Norwegian target shooting community, Larsen’s older designs slowly faded in popularity. The rifles are quite rare here in the United States.
This example is a single shot falling block action using Larsen’s unique design.