Control Lab · 9751-1
LEGO 9751-1 Control Lab Serial Interface & Adapter
New / sealed value$174.95337.9% above original retail
Original retail$39.95Launch price
Used value$135.00Current estimate
90-day trendN/A123 months recorded
PRICE GUIDE
Current LEGO 9751-1 values
Condition-specific market estimates compared with the original retail price.
New / sealed value
$174.95
+337.9% vs. retail
Used value
$135.00
$123.00 – $162.00
Original retail
$39.95
Launch price
Market values are estimates for the set condition shown; live retailer and marketplace prices may differ.
MARKET TREND
Price history
Source-reported monthly market closes through Aug 2026; these can differ from the current estimated market value.
Monthly close$196.2324 plotted months
Used value$135.00Current estimate
Used range$123.00 – $162.00Current low to high
Latest monthly close$196.23
Period low$149.79
Period high$217.47
Period change+8.1%
MARKET VALUE
Sealed price history
Latest
$196.23
+8.1% over period
View monthly price data
| Month | Open | Low | High | Close | Sales | Source |
|---|---|---|---|---|---|---|
| 2026-08 | $169.47 | $160.55 | $214.07 | $196.23 | N/A | Market data provider |
| 2026-07 | $163.35 | $157.43 | $192.97 | $181.13 | N/A | Market data provider |
| 2026-06 | $168.75 | $159.86 | $213.15 | $195.39 | N/A | Market data provider |
| 2026-05 | $172.71 | $166.45 | $204.03 | $191.51 | N/A | Market data provider |
| 2026-04 | $161.43 | $152.94 | $203.91 | $186.92 | N/A | Market data provider |
| 2026-03 | $171.97 | $165.73 | $203.16 | $190.68 | N/A | Market data provider |
| 2026-02 | $167.32 | $158.51 | $211.35 | $193.74 | N/A | Market data provider |
| 2026-01 | $144.75 | $139.50 | $171.00 | $160.50 | N/A | Market data provider |
| 2025-12 | $187.82 | $177.93 | $237.24 | $217.47 | N/A | Market data provider |
| 2025-11 | $182.10 | $175.49 | $215.12 | $201.91 | N/A | Market data provider |
| 2025-10 | $181.02 | $171.50 | $228.66 | $209.61 | N/A | Market data provider |
| 2025-09 | $169.77 | $163.61 | $200.55 | $188.24 | N/A | Market data provider |
| 2025-08 | $158.66 | $150.31 | $200.41 | $183.71 | N/A | Market data provider |
| 2025-07 | $135.09 | $130.19 | $159.59 | $149.79 | N/A | Market data provider |
| 2025-06 | $161.49 | $152.99 | $203.99 | $186.99 | N/A | Market data provider |
| 2025-05 | $192.99 | $185.99 | $227.99 | $213.99 | N/A | Market data provider |
| 2025-04 | $165.29 | $156.59 | $208.79 | $191.39 | N/A | Market data provider |
| 2025-03 | $165.90 | $159.88 | $195.99 | $183.95 | N/A | Market data provider |
| 2025-02 | $155.00 | $146.84 | $195.79 | $179.47 | N/A | Market data provider |
| 2025-01 | $165.19 | $159.20 | $195.15 | $183.16 | N/A | Market data provider |
| 2024-12 | $182.93 | $173.31 | $231.07 | $211.82 | N/A | Market data provider |
| 2024-11 | $177.35 | $170.92 | $209.51 | $196.65 | N/A | Market data provider |
| 2024-10 | $163.11 | $154.53 | $206.04 | $188.87 | N/A | Market data provider |
| 2024-09 | $163.72 | $157.78 | $193.41 | $181.53 | N/A | Market data provider |
VALUE OUTLOOK
Growth and retirement
Total growthN/ACurrent sealed value vs MSRP
Annual growthN/A12-month close change
1-year forecast$180.60+3.2%
5-year forecast$202.95+16%
5-year range$197.00 – $208.00Collected estimate
Used value range$123.00 – $162.00Observed market range
MethodSource-provided projectionDisplayed as collected; BrickPriceWatch does not recalculate it.
Forecast sourceMarket data providerSource attached to the forecast fields.
Recorded history123 monthsCurrent history coverage on BrickPriceWatch.
ConfidenceNot independently scoredA range appears only when the source supplies bounds.
Forecasts are directional estimates, not guaranteed future prices or investment advice. Actual value depends on condition, demand, fees, and sale timing.
Retired Dacta Technic hardware, Control Lab Serial Interface & Adapter from the Dacta Technic line has become scarce after a long retirement and draws interest from educational and Technic completionists for its early LEGO computer-control significance, and liquidity is thin with volatile trading that limits broad-market appeal.
SET PRICE GUIDE
LEGO 9751-1 Control Lab Serial Interface & Adapter price, value and history
LEGO 9751-1 Control Lab Serial Interface & Adapter is a set released in 1995 in the Control Lab theme with 2 pieces. This BrickPriceWatch price guide combines a current new and sealed value of $174.95, an original retail price of $39.95, and 123 months of source-reported price history in USD.
The current comparison is based on collected market observations rather than a guaranteed selling price. The recorded used value is $135.00. The set is recorded as retired.
Current market dataa current new and sealed value of $174.95
Retail comparisonan original retail price of $39.95
Retailer availabilityno recent verified retailer quote; open the offer panel for the latest observed links.
How to use this LEGO price guide
Use the price guide to compare new and sealed value with the original retail price, inspect monthly high, low, and closing prices, and review current retailer offers before buying. Set condition, completeness, packaging, shipping, taxes, and marketplace timing can change the final price.
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