I have the 5th edition of this book (printed in 1989), its circulation is 75000 copies.Another typical information provided is circulation, i.e. how many copies were printed. My copy of Popova Goldberg reports Тираж 40 000 экз. (short for экземпляр.) Since there have been at least three or four editions of this book, and all with similar circulation, this is probably one of the most widespread watch-making books ever written.