That rifle may be one of the dozens used in the 1976 Palma matches at Camp Perry Ohio, USA. Winchester made them with special markings on the 26" barrel and a unique trigger. They shot Winchester Match ammo that year which did well in those Winchester barrels. They all had a few hundred rounds through them when bought by the match participants. Their bridge had a clip guide for reloading in rapid fire matches. Redfield sights were used; International on the back end and Big Bore up front.
I had one for a few years and it did great with Western match ammo with 197-gr. HPBT Winchester match bullets. Best accuracy's been with bullets at least .3086" diameter.
More info on all the Winchester Palma rifles is at: