Bob it is a Persian Mauser, very sought after rifle amongst collectors. It's a VZ 24 Mauser action built by Brno. The double trigger might be an after market add on the gun. I got this information from a friend of mine who is a gun collector here in South Africa.
Wikipedia
The vz. 24 rifle[3] is a bolt-action carbine designed and produced in Czechoslovakia from 1924 to 1942. It was developed from the famous Mauser Gewehr 98 line, and features a very similar bolt design. The rifle was designed in Czechoslovakia shortly after World War I, featuring a 600 mm (23.6") barrel which was shorter and considered more handy than the 150 mm (5.9") -longer Gewehr 98. The carbine followed a similar trend in weapon design at the time, that a short rifle gave away little in ballistic efficiency at combat ranges, but was easier to handle on account of its shorter length.
During World War II, the vz. 24 was produced for the German armed forces during its occupation. The rifle was also produced in nearby Slovakia, a German ally and puppet state during the war.
The vz. 24 rifle was widely exported and enjoyed usage during and after World War 2, noticeably by Romania, Imperial State of Persia, Guatemala, China and others. Many of the contract rifles made for South American countries were chambered in 7mm Mauser or 7.65×53mm Argentine.