The term “Parawater” was the one used by Citizen to describe that the watch was water resistant.
In 1959 the company produced the first Japanese water-resistant wrist watch. This was the “Citizen Parawater”. It was powered by the Citizen Cal. 920(2B). Soon after, the Parawater completed two trans-Pacific tests and one in the Sea of Japan. The result, needless to say, was positive. As time passed Citizen was growing as a company and exported more and more watches, so the term “Parawater” was changed to the universally recognized “Water resistant” somewhere around 1970-1973.
Read more about Citizen diving watches here: https://vintagecitizenwatches.com/diver-vcw/
The term “Parashock” came to life in 1956 when the company produced the first shock-proof Japanese watch, known as the “Parashock”. So first was the “Parashock” and three years later the “Parawater”.
Even though you have a parashock and a parawater watch, please don’t treat it as a modern Casio G-shock. 🙂