Set Details
- Set Number
- 105
- Name
- Imagination Set 5
- Theme
- System
- Year
- 1971
- Pieces
- 917
- Complexity
- Advanced
- Build Time
- 4-8 hours
- Ages
- 14+
- Type
- Both play and display
About LEGO Imagination Set 5
LEGO Imagination Set 5 (set #105) is a large, detailed build with 917 pieces from the System theme, released in 1971. At 917 pieces, this is a advanced-level build with an estimated build time of 4-8 hours, suitable for ages 14+. This set dates from the pre-minifigure era, before LEGO introduced its iconic yellow-faced figures in 1978.
Set Highlights
- 917 pieces at advanced complexity — a 4-8 hours build.
- Compatible with all standard LEGO sets — bricks extend naturally into other sets you own.
- Versatile build — display-worthy when complete, durable enough for active play.
- Vintage 1971 release — increasingly rare in complete, unplayed condition.
Who Is This Set For?
Gift for Ages 14+
The advanced difficulty makes this accessible without being trivial — a well-matched gift for LEGO fans in the 14+ age range.
Weekend Build Project
917 pieces with an estimated 4-8 hours fits comfortably into a focused afternoon or weekend session.
Expanding a System Collection
A solid addition for collectors building out their System shelf. Introduces parts and builds that complement other sets from the same line.
Build Tips
A five-minute sort by color or piece type before starting saves time hunting for specific bricks mid-step.
Follow the numbered steps in sequence — structural elements early in the build support everything that comes after.
Vintage sets may show slight color variation from modern LEGO due to different ABS formulas. This is normal and part of the set's character, not a defect.
Finding Instructions
Instructions for older sets like #105 (1971) may not always be available on LEGO.com. Try searching the set number directly, or upload a photo of the bricks to LegoFinder — the AI can identify vintage sets from their parts.
Imagination Set 5 FAQ
Related Reading
More System Sets
See all System →
Also Released in 1971
All 1971 sets →Similar Build Difficulty
Sets at roughly the same piece count and complexity tier — different theme and year, but a similar build experience.
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