Brick Reserve
Strategy
X

All sets in the catalog

Cat D11 Bulldozer

Technic, 3,854 pieces. One of the sets the Brick Reserve tracks, and if the policy allows it, buys sealed and keeps.

Set 42131

The box

Our packaging design, not LEGO's. Boxes enter the vault sealed and stay that way.
Set number
42131
Theme
Technic
Pieces
3,854
Retail price
$499.99
Released
October 2021
Status
Retired

The reserve can buy this

Rule 02 of the reserve policy is scarcity: a set has to be retired, or have a published retirement date, before any fee money goes near it. 42131 clears that rule, and like every box it would be bought factory-sealed and never opened.

BrickEconomy states the set retired 18 Oct 2023 and LEGO.com marks the product page 'Retired Product'; Brickset's own Launch/Exit field shows an apparently stale '01 Oct 21 - 31 Dec 21' exit date that conflicts with both of those and was treated as a Brickset data error. Checked 12 Sept 2026.

What this box costs in trading

$37,036

of $BSTR trading volume funds one Cat D11 Bulldozer at $499.99.

  1. 2.7% of every trade reaches the fee router as creator fees.
  2. 50% of that is the reserve's share, so 1.35% of volume becomes brick money.
  3. $499.99 ÷ 1.35% = $37,036 of trading for this box.

Retail is the yardstick. A retired set usually costs more on the secondary market, and the fee split is the one published on the strategy page.

Specs

Assembled height
26 cm
Boxed weight
6.03 kg
Box
58.2 × 48.0 × 17.0 cmwidth × height × depth
Sealed value
$918.00BrickEconomy, 12 Sept 2026

In the vault

No box of 42131 is in the vault yet. Every acquisition is logged on-chain in order and appears on the acquisitions page with its receipt, photo and custody record.

The war chest is currently saving for 10307 Eiffel Tower, not Cat D11 Bulldozer. See the war chest.

Check it yourself

Piece counts, weights and retirement dates come from these pages. LEGO.com opens its search for 42131, because a retired set no longer has a live product page.

BricksetBrickEconomyBrickLinkLEGO.com

The reserve buys sealed boxes only, under three rules: 01 Sealed, 02 Scarce, 03 Liquid. Holding $BSTR gives no claim on this box or any other, there is no redemption, and sealed sets can lose value. The sealed value above is a dated reference, not a forecast.

LEGO® is a trademark of the LEGO Group, which does not sponsor, authorise or endorse this project.