I also have a Classical Guitar Marcelino Barbero that I bought in 1984 from Rosewood Guitar, Seattle WA. The tag inside the guitar indicates that it was built in 1967 and another number to the left shows 1882. In between and above the numbers is the word MADRID (I don’t know what MADRID is) Back then, I paid more than $600 dollars. It took me almost two years to pay off the guitar. I have never tried to find out the value of it, but in the year 2000 I joined the Seattle Guitar Orchestra and tried to compare the sound quality with the $9000 thousand guitar from one of the players in my group. I noticed that the sound quality of mine was better (louder with high notes and warmer with low notes) than the $9000 dollar guitar. To replace the sound quality like the one I am having now, I expect that it would cost between 10K to 15K to replace it.