Decode the Cosmos!
Join the Space Police with 34 pieces

Crack the Blacktron's secret messages with this classic 1989 set. A nostalgic build for space-faring LEGO fans.

LEGO Message Decoder set 6831 - 34 pieces, Space Police I theme, product photo Pin It
LEGO Message Decoder set 6831
🏛 Space Police I
Set #6831

Message Decoder

The Message Decoder is a charming slice of classic LEGO Space Police.

🏆 Best For: Perfect for younger builders or those looking for a quick, nostalgic build ⏱ 0.5 hr build 🧩 34 pcs
★★★★☆ 4.2

Fans appreciate this set's nostalgic value and classic Space Police design. Some find the build simple, but collectors value its rarity and the iconic minifigure.

MSRP
$2.99
Best Price
$2.69
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📝 Our Take

The Message Decoder is a charming slice of classic LEGO Space Police. Released in 1989, this small set perfectly encapsulates the theme's futuristic aesthetic and focus on capturing space criminals, all in a fun, buildable package.

This set is perfect for LEGO Space enthusiasts and collectors of vintage sets. It's a quick and enjoyable build that offers a nostalgic trip back to the early days of LEGO Space Police, plus it's a great display piece for showing off your classic LEGO collection.

Skip this if you're only interested in large, complex sets. If you prefer modern building techniques and intricate designs, consider exploring newer LEGO Space themes like LEGO City Space or LEGO Ideas sets.

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🧱 Building Experience

🧩
34
Pieces
⏱
0.5h
Build Time
📊
Beginner
Difficulty
Build Highlights:
  • Simple, straightforward building process
  • Incorporates classic LEGO hinge techniques
  • Features a printed slope with the Space Police logo
  • Compact and easily displayable model

📈 Investment Analysis

↑ Trending up since release
B+
Investment Grade
⏳ Appreciating
The Message Decoder presents a unique investment opportunity due to its age, theme, and relatively low piece count. As a classic Space Police I set from 1989, it carries significant nostalgic value for collectors. Its rising price trend indicates increasing demand, driven by the scarcity of sealed or complete sets. While the low piece count might deter some investors, the set's rarity and appeal to a niche market of vintage LEGO collectors contribute to its potential for appreciation. However, condition is critical; a set in pristine condition with original packaging will command a higher premium. The set's retirement risk is non-existent, it's been retired for decades!

Not Financial Advice: Content is for educational purposes only. Past performance doesn't guarantee future results. Full disclaimer

⚖ Compare Similar Sets

Galactic Chief
Galactic Chief
Space Police I • 25 pcs
$2.25
Spy Runner
Spy Runner
Space Police I • 43 pcs
$5.50
Particle Ionizer
Particle Ionizer
Space Police I • 94 pcs
$12.50
The Message Decoder stands out as a classic example of early LEGO Space sets, characterized by its simplicity and charm. Compared to modern sets with intricate designs and high piece counts, this set offers a nostalgic building experience. While newer Space Police sets like 6984-1 Interstellar Starfighter offer more complex builds and advanced features, the Message Decoder appeals to collectors seeking a piece of LEGO history.

1 Minifigures Included

Space Police I
Space Police I
6 parts
Includes one Space Police I minifigure, featuring the classic black and white uniform with the Space Police logo. This minifigure is a hallmark of the theme and adds to the set's collectible appeal.
Browse All Minifigures → | Best Investment Minifigs

📦 Full Parts Inventory - 19 unique parts • 29 total pieces

Plate Special 2 x 2 with Wheels Red Plate Special 2 x...
Part #: 122c01 2× Black
Headwear Accessory Visor For Standard Helmet Headwear Accessor...
Part #: 2447 1× Trans-Red
Lever Small Base with Black Lever Lever Small Base ...
Part #: 298c02 2× Black
Plate 2 x 4 Plate 2 x 4
Part #: 3020 1× Black
Plate 2 x 2 Plate 2 x 2
Part #: 3022 1× Black
Slope 45° 2 x 2 Slope 45° 2 x 2
Part #: 3039 1× Blue
Slope 33° 3 x 2 with 'POLICE' print (Space Police I) Slope 33° 3 x 2 w...
Part #: 3298pr0013 1× Black
Wheel Arch, Mudguard 2 x 4 [Smooth] Wheel Arch, Mudgu...
Part #: 3787 2× Black
Plate 2 x 10 Plate 2 x 10
Part #: 3832 1× Black
Hinge Brick 1 x 2 Base Hinge Brick 1 x 2...
Part #: 3937 1× Blue
Hinge Brick 1 x 2 Top Plate Thin Hinge Brick 1 x 2...
Part #: 3938 1× Black
Antenna 1 x 4 with Rounded Top Antenna 1 x 4 wit...
Part #: 3957a 2× Black
Brick Special 1 x 1 with Headlight Brick Special 1 x...
Part #: 4070 2× Blue
Wheel Full Rubber Balloon with Axle hole Wheel Full Rubber...
Part #: 4288 4× Black
Plate Special 1 x 4 Offset with Bar Holes Plate Special 1 x...
Part #: 4590 1× Black
Dish 2 x 2 Inverted [Radar] Dish 2 x 2 Invert...
Part #: 4740 2× Trans-Red
Wedge Plate 3 x 4 without Stud Notches Wedge Plate 3 x 4...
Part #: 4859 1× Blue
Bar 1 x 6 [Open Studs] Bar 1 x 6 [Open S...
Part #: 4873 1× Black
Plate Round 1 x 1 with Solid Stud Plate Round 1 x 1...
Part #: 6141 2× Trans-Red
The set includes several classic LEGO elements in black and trans-red, common for the Space Police I theme. The printed 'POLICE' slope is a standout piece, adding unique detail to the model.

🛒 Where to Buy

eBay
✓ In Stock
$2.69 →
Walmart
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$2.84
Target
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$2.99
Amazon
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💎 Notable Parts

Black Slope 33° 3 x 2 with 'POLICE' print (Space Police I) (1x) $2.00
Blue Brick Special 1 x 1 with Headlight (2x) $0.50
Black Plate Special 2 x 2 with Wheels Red (2x) $0.75
Est. BrickLink Part Value
$3.25

💡 MOC Potential

🚀 Small space rover or reconnaissance vehicle
🤖 Simple communication droid or repair bot
🚢 Micro-scale Space Police interceptor

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Charts Inventory Statistics

19
Unique Parts
29
Total Pieces
1
Minifigures
Inventory Version: 1

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