Taking a trip to 1968

I dont think I have had the opportunity to tell you about the bi-weekly trip I get to take back in time!
To return to the year 1968 the only think you need to do is come to Horqueta, Paraguay and go to the bank. Walking up to the bank you are greeted by two security guards with very large machine guns (probably not something out of 1968...but adds to the experience!) Upon entering the bank you are suddlenly overwhelmed with the smell of old record books and the sounds of a zzzah-zzzah-zzzah printer, you know the kind that scans across the page and has the perferated edges and sometimes prints two pages together? Everything is painted tan and every cashier has slicked back hair and big glasses, most wear short sleeved collar shirts and ties (which for some reason reminds me of the past) To get your money from the teller you wait in line...one that is not well formed and you arent really sure it leads to the teller thatn you want to talk to. When you get to the teller (if you are so lucky!) you are standing in front of what looks to be more like a ticket booth for carnival ticket sales - a desk that is much less formal than what most Americna banks look like. You hand the friendly fella behind the counter your ID and your bank card, tell him how much $$ you want and he whips it out! Then prints you out a reciept, stamps it three times and off you go. You start to think that this is the end of your business transaction. Because normally, in the US, when you go to the bank to take out money - thats the end of the story, you have money. The End. In Paraguay, that is not the end of the story. Because the moment you walked in to 1968 - everyone in town knew you were there. And later in the afternoon when you are a sitting around with your neighbors drinking Terere one of them mentions a number ($) and look at you. And you think to yourself...thats weird...why are we talking numbers while drinking terere? And then he says...thats how much money you took out of the bank today....right?
WHAT? How do people know this stuff?

It is one of the great mysteries of Paraguay!

I am off to 1968!