The rifle had a Kenyon trigger and is a Winchester 52 E International. The stock is not unusual for that model.
The question of whether 1/2" groups at 200 yards with .22LR can be achieved consistently or with regularity is not usually the subject of debate, tightly controlled testing or not.
First and foremost, consider that .22LR accuracy performance is not linear. In other words, groups size typically
more than doubles as distance doubles.
Why does it more than double? As distance increases, vertical dispersion due to MV variation alone more than doubles as distance doubles. To illustrate, the same MV variation between two rounds (10 fps) that causes a .22LR bullet to drop about .07" at 50 yards results in a .25" drop at 100, and about 1" at 200.
See the ballistics chart below which shows two rounds, one with a nominal MV of 1073 fps, the other 1083 fps.

Second, the above applies to ammo that is
perfect except for the difference in MV. Any very slightest of differences in the bullet itself, especially in the heel or in center of gravity offset (which, like airgun pellets, cannot be near perfect with soft lead .22LR bullets), will only further exacerbate performance challenges.
Even with the shooter taken out of the equation by use of a vise or fixture and wind or air movement eliminated by shooting in a 200 yard testing tunnel (if one has existed for .22LR), ammunition shortcomings make 1/2" groups with .22LR at 200 yards random rather than expected or produced consistently.
If there was better .22LR match ammo available, the kind capable of regularly producing 1/2" groups at 200 yards, serious shooters would have cause to celebrate. Unfortunately, such ammo is exceedingly rare and can't be manufactured on demand. That was true in the past and it's true today, with the best ammo production standards that have existed.