There is a Manuel Ramirez advertised for sale on reverb that I would be cautious about. The label is right for the period (1903-1909) but the headstock is not one that Manuel is know to have used. It looks like a clumsy attempt at a Jose Ramirez III headstock. The guitar, itself is certainly, an old instrument-- but seems to have been altered to deceive. The seller in their defense back handedly tells the buyer to be beware: "Admittedly, guitars of this particular breed and vintage are not our richest area of expertise; we welcome any information that can be offered!"
James, Zavaleta's La Casa de Guitarras