In 1957, LEGO released 20 System i Leg sets across 3 subthemes, all of these sets have been retired. Subthemes for that year included HO 187 Vehicles, Supplemental, and Town Plan.
Most valuable 1957 LEGO System i Leg set
1308 Fire Station $5,556.10
Largest 1957 LEGO System i Leg set
1309 Church 150 pieces
Most owned 1957 System i Leg set
283 Red Sloping Ridge and Valley Bricks
Theme / Subtheme System i Leg / Town Plan
Year 1957
Pieces 1
Availability Retired
200-3 LEGO Town Plan Board Plastic
Retail $3.75
Theme / Subtheme System i Leg / Town Plan
Year 1957
Availability Retired
200A LEGO Town Plan Wooden Board
Retail $4.50
Theme / Subtheme System i Leg / Supplemental
Year 1957
Availability Retired
214-4 LEGO Windows and Doors Retailer Pack
Value $886.89
Theme / Subtheme System i Leg / Supplemental
Year 1957
Availability Retired
225 LEGO 1x6 and 1x8 Bricks
Retail $0.50
Theme / Subtheme System i Leg / Town Plan
Year 1957
Pieces 69
Availability Retired
236-2 LEGO Garage and Van
Retail $4.50
Value $1,800.00
Growth  +39900.0%
Theme / Subtheme System i Leg / Supplemental
Year 1957
Pieces 20
Availability Retired
283 LEGO Red Sloping Ridge and Valley Bricks
Retail $0.50
Value $26.53
Growth  +5206.0%
Annual growth 3.7%
Theme / Subtheme System i Leg / Supplemental
Year 1957
Pieces 20
Availability Retired
283-2 LEGO Blue Sloping Ridge and Valley Bricks
Retail $0.50
Theme / Subtheme System i Leg / Town Plan
Year 1957
Availability Retired
LEGO Town Plan Wooden Board
Retail $3.75
Theme / Subtheme System i Leg / Supplemental
Year 1957
Pieces 20
Availability Retired
1223-3 LEGO 2x2 Curved Bricks
Retail $0.50
Theme / Subtheme System i Leg / Supplemental
Year 1957
Availability Retired
1231-4 LEGO Windows and Doors Retailer Pack
Theme / Subtheme System i Leg / Supplemental
Year 1957
Pieces 4
Availability Retired
1233-2 LEGO Light Masts
Retail $0.50
Theme / Subtheme System i Leg / Supplemental
Year 1957
Pieces 50
Availability Retired
1234-2 LEGO Letter Bricks
Retail $0.50
Theme / Subtheme System i Leg / Supplemental
Year 1957
Pieces 5
Availability Retired
1242-2 LEGO International Flags
Retail $0.50
Value $248.27
Growth  +49554.0%
Annual growth 8.6%
Theme / Subtheme System i Leg / Supplemental
Year 1957
Pieces 5
Availability Retired
LEGO 5 Danish Flags
Retail $0.50
Theme / Subtheme System i Leg / Supplemental
Year 1957
Pieces 3
Availability Retired
1245-2 LEGO Lighting Device Pack
Theme / Subtheme System i Leg / HO 1:87 Vehicles
Year 1957
Pieces 24
Availability Retired
1260-2 LEGO 1:87 Twenty Four Models
Retail $18.00
Theme / Subtheme System i Leg / Town Plan
Year 1957
Pieces 45
Availability Retired
1306 LEGO VW Garage
Retail $5.50
Value $4,055.46
Growth  +73635.6%
Annual growth 10.4%
Theme / Subtheme System i Leg / Town Plan
Year 1957
Pieces 51
Availability Retired
1307 LEGO VW Auto Showroom
Retail $4.25
Value $3,181.05
Growth  +74748.2%
Annual growth 10.4%
Theme / Subtheme System i Leg / Town Plan
Year 1957
Pieces 111
Availability Retired
1308 LEGO Fire Station
Retail $4.50
Value $5,556.10
Growth  +123368.9%
Annual growth 11.2%
Theme / Subtheme System i Leg / Town Plan
Year 1957
Pieces 150
Availability Retired
1309 LEGO Church
Retail $4.50
Value $2,747.80
Growth  +60962.2%
Annual growth 10.1%