Nice find and looks to be in wonderful shape. BRNO manufactured the Model 1 from 1946 to 1956 and best view is that about 170,000 Model 1 rifles were built. Yours was manufactured in 1954 and has a beech stock. A classic, well-built and desirable rifle!
You will find a lot of information on BRNO rimfires at RimfireCentral (just google it). They have lots of history and original brochures for this great little rifle. Be sure to check out the BRNO stickies produced by user TOU. Hours and hours of reading there.