Full-data QSL letter in 31 days for English language report, souviner postcard, mint stamps, address label and envelope, v/s Boris Maduna, Duty Officer. No official mailing address in the letter or envelope, but I used the mailing address listed below. From the comments from MRCC Rijeka, this address may be for coast radio station Rijekaradio rather than MRCC Rijeka.
CRS Rijeka Radio
Milutina Barača 3