Consensus is that it is a river monitor SAVA, ex K-u.K. monitor Bodrog
Built in 1904 (!) in Budapest she became part of K.u.K. Danube flottila as SMS Bodrog. She was river monitor of Temes class. To some info fired first shots in the Great war.
Damaged at the beggining of the world war 1 near Beograd, repaired and served trough entire war.

In april 1920 became part of Yugoslav navy's Danube warship flottila as Monitor SAVA (in cyrilian aphabet CABA). At time of german attack (06. april 1941) served also as river AAA batery. Sunk by own crew on 12.04.1941 in Zemun harbour.

Salvaged and repaired by NDH (independent state of Croatia) and served in their service up to 8./9. september 1944 when sunk by own crew (again) at Slavonski Brod.

After war salvaged and served up to 1959 when phased out of service. Served in civilian navy up to 1962 when it was retired.

Now owned by firm Heroja Pinkija as floating magazine.

Pictures May 2006 Port of Novi Sad Danube