From Stamps of the World
Debrecen is the second largest city in Hungary after the capital Budapest. It is the regional centre of the Northern Great Plain region and the seat of Hajdú-Bihar county. Population 204,333 (2013).
Postmarks in Hungary
Postmarks in the Kingdom of Hungary (1867-1946)
Postmarks in Austrian Empire Hungary Crownland
The name was DEBRECZIN or DEBRECZEN before 1867.