Old Czech bottle dated 1948, thick glass

Light green tinted thick glass bottle. Text embossed in czech: dr- f (?) - zatka ("bouchon") - a.s on the other side, a logo that appears to be two "zs", nested one below the other, and that could correspond to the presence of gas, so possibly a carbonated drink. Under: 0.5 l / and a date: 1948. Inside shard on the porcelain cap. Height: 23 cm / diameter: 7.5 cm.