Dollar/Mexican Peso exchange rate in December 1980

Hello.

You didn't specify a particular day of the month, so I checked the New
York Times on three dates: December 7, 16 & 27, 1980.

In December 7 & 16 issues :

$ value per Mexican peso -   0.434
Mexican pesos per dollar -  23.19

source: New York Times, December 16, 1980, page D14
http://pqasb.pqarchiver.com/nytimes/results.html?st=advanced&QryTxt=peso&By=&Title=&datetype=6&frommonth=12&fromday=16&fromyear=1980&tomonth=12&today=16&toyear=1980&restrict=articles&sortby=REVERSE_CHRON

source: New York Times, December 7, 1980, page F17
http://pqasb.pqarchiver.com/nytimes/results.html?st=advanced&QryTxt=dinar+franc&By=&Title=&datetype=6&frommonth=12&fromday=07&fromyear=1980&tomonth=12&today=07&toyear=1980&restrict=articles&sortby=REVERSE_CHRON
 

In the December 27th issue:

$ value per peso -   0.432
pesos per dollar -  23.17

source: New York Times, December 27, 1980, page 34.
http://pqasb.pqarchiver.com/nytimes/results.html?st=advanced&QryTxt=peso&By=&Title=&datetype=6&frommonth=12&fromday=27&fromyear=1980&tomonth=12&today=27&toyear=1980&restrict=articles&sortby=REVERSE_CHRON

---------
search strategy:
New York Times Historical Archive: peso, franc, dinar

I hope this helps.