Please edit my composition: A century calendar

Would someone kindly take a look at my composition?
______________________________________________________

Talking about the question what is 'reality' I'm reminded of such an anecdote: years ago, a certain stationery company put a new product on the market. It was a calendar -- a century calendar, as they called it(Q1). It was a newspaper-sized paper sheet in which printed -- in fine prints -- each 365 times 100 date(Q2).

After a while the sale of that century calendar was prohibited. There were allegedly several people who sued the company because they got to feel like committing suicide while looking at the calendar.
_______________________________________________________

Q1. Now I'm wondering whether the usage of indefinte article in the underlined part is wrong or not. Should I rewrite it as "It was a calendar -- Century Calendar, as they called it"...?

Q2. Please edit this sentence if it's not clear. Especially the last part...!
It was a newspaper-sized paper sheet in which printed -- in fine prints -- each 365 times 100 date.

Q3. How can I make it more readable, more natural, and if possible, more effective?

(Thank you so much for your any comments, in advance!)