In the Radiocarbon journal the ratio is reported, so readers can calibrate for themselves. Well, it turns out the problems with early carbon were so severe, that many historians were on the verge of abandoning it.
Now clams take in ocean carbonate, which contains almost no C14, so that it is no surprise today that a clam shell date appears ridiculously old. A more difficult to deal problem with radiocarbon dating came from Egyptian and Mesopotamian artifacts when the dates were already known. When you have records dated by the scribes, as well as actual mummies and the carbon dates are not off by hundreds of years but by thousands, you either have to throw away christianity vs carbon dating historical record, or else there was a general failure with carbon dating.
Libby, who won a Nobel Prize in for C14 dating, failed to question his uniformitarian assumption, that the ratio had reached static equilibrium.