In 1984, LEGO released 2 Castle Black Falcons sets, all of these sets have been retired. For that year, the total price of all retail sets cost $33, today those sets are valued around $1,992, a growth of 5941%.
Most valuable 1984 LEGO Castle Black Falcons set
6073 Knight's Castle $1,683.91
Most owned 1984 Castle Black Falcons set
6030 Catapult
2 sets

6030 Catapult

Theme / Subtheme Castle / Black Falcons
Year 1984
Pieces / Minifigs 83 / 2
Availability Retired
6030 LEGO Black Falcons Catapult
Retail $5.99
Value $308.49
Growth  +5050.1%
Annual growth 7.2%

6073 Knight's Castle

Theme / Subtheme Castle / Black Falcons
Year 1984
Pieces / Minifigs 410 / 6
Availability Retired
6073 LEGO Black Falcons Knight's Castle
Retail $26.99
Value $1,683.91
Growth  +6139.0%
Annual growth 6.2%