Alfonso XIII of Spain Definitive Stamp (Reverse)

Spain · 1910 ·

This image shows the reverse of a 1910 definitive stamp featuring King Alfonso XIII of Spain. The back displays a blue control number 'D.558.192' and a postmark from Toledo, 1921.

Issued during the reign of King Alfonso XIII, this definitive stamp reflects the Spanish monarchy's presence in daily life. The control number on the reverse was a security measure or for inventory tracking.