There appears to have been very little research done to identify 20th century Columbian, indeed, any 20th century South American silversmith's marks. All I can say is your mark is struck in a similar format to the other maker's marks that are known to be from Columbia.
I'll soon start a topic in the 'Contributors Notes' section of the forum to see if we can gather some information together on this neglected subject.
Do your other items bear exactly the same mark? Can you provide a clearer image of them?