Those old Biathlon rifles cannot be very common. Value? No idea.
Wikipedia has:
"In 1960, the sole event was the men's 20 km individual, with shooting at the four distances of 100, 150, 200 and 250 meters. From 1963, all biathletes switched to cartridges based on the 6.5 mm projectile. As a result, the Soviet Union developed the Bi-6.5 rifle and the new cartridge .220 Russian (5.6×39mm) (which would later lead to development of the famous 5.45×39mm military cartridge). The newly developed 5.6×39mm cartridge was also used in 100 meter running deer competitions in specially developed sport rifles such as the MBO-1M and MBO-2 (МБО-2 [ru]) straight pull rifles, as well as the MBO-3 pump rifle."
en.wikipedia.org
and:
"Designer A. E. Ozerov
Manufacturer Izhevsk Machine-Building Plant
Produced 1964-1972
The MBO-1 (МБО-1) is a Soviet bolt-action target rifle for competitive shooting sports (100 meter running deer exercise and Olympic games).[1]
The MBO-1 has heavy barrel with six grooves (420 mm twist rate) and non-detachable internal box magazine.[1]
All rifles had a wooden stock and fore-end.
Variants
MBO-1 (МБО-1) - first model, 4.3 kg, 730 mm barrel, diopter sight[1]
MBO-1M (МБО-1М) - second model, 5.0 kg, 680 mm barrel[1]
MBO-1K (МБО-1К)
MBO-2 (МБО-2) - last model, 5.0 kg, 560 mm barrel, with muzzle brake and optical sight"
en.wikipedia.org
I found a Finnish police gun auction list with one. That is both confiscated guns and otherwise surrendered to police. Manufacturer is listed as Izhevsk
Putting Izhevsk "MBO-1M" in google gives some results.
