Great for a gift: H27 brass perpetual calendar on a wooden base - you can find every day of the week in 1600-2799! It's an old system called Dominical letters - Sunday letters. Renaissance style. Wed 9cm, d. 6cm. Original operating manual in several languages: English, French, Spanish, Italian. How to use the calendar? Contrary to appearances, the principle of searching for dates is simple. Let's say we want to check which day of the week falls on March 2, 2019. To do this, we turn the calendar to the face of the moon. In the moving ring we look for the number 20 and place it in line with the number 19, which we find on the stationary dial. Then we move the rear sight with the inscription Letra Dominical to the 19th, which allows us to check which letter was under the 20th when the 20th and 19th were in one line. In our case it is the letter F. The next move is on the side of the sun's face. The month of March, marked on the ring with the letters MAR, is placed under F. After that, we see that the 2nd day of the month - we are now looking at the lower part of the fixed dial showing days from 1 to 31, coincides with the letter S, which means that on March 2, 2019 . to S - Saturday. In the case of a leap year, it will turn out that we will meet 2 letters in the Szczerbinka. Then the rule is that the first applies to March 1 of a given year, and the second applies to each day after March 1 of that year. Remaining steps as above. Example: let's check what day of the week is June 10, 2020. On the side of the moon, we place the 20 moving target under the 20 on the stationary one. We use the rear sight and see that under the 20 there are the letters D, E. We are talking about the date after March 15th, so we take into account the letter D. With this information we go to the page with the sun face. JUN - June is placed under D. At the bottom we can see that the 10th of June is under X–miercoles - Wednesday. The calendar is based on the names of the month and days of the week in Spanish. The translation below: Month names: Ene- enero - January Feb - febrero - February Mar - marzo - March Abr- abril - April May- mayo - May Jun - junio - June Jul - Julio - July Ago- agosto - August Sep - Septembre - September Oct - October - October Nov - November - November Dic - Diciembre - December Days of the week: Days of the week: L - lunes - Monday. M - martes - Tuesday. X - miércoles - Wednesday. J - jueves - Thursday. V - viernes - Friday. S - Sábado - Saturday. D - domingo - Sunday Centuria - Letra dominical age - Sunday letter