M-Tron is a subtheme of Space that consists of 9 sets that ran from 1990 to 1991. Most sets were released in 1990 which accounted for 7 sets. As of today, the average annual growth of sets in Space M-Tron is approximately 7.4% per year.
Most valuable Space M-Tron set
6923 Particle Ioniser $2,700.00
Largest Space M-Tron set
6989 Mega Core Magnetizer 503 pieces
Most owned Space M-Tron set
6811 Pulsar Charger
M-Tron (also written M:TRON) was a LEGO Space subtheme released in 1990 that consisted of 8 sets where the M-Tron were depictedas a rescue and repair faction in all LEGO catalogs except for the United States, where they are described as a mining faction. M-Tron was also the last space theme to carry the LEGOLAND banner and was changed to just LEGO System.
9 sets

6862 Secret Space Voyager

Theme / Subtheme Space / M-Tron
Year 1991
Pieces 254
Availability Retired
6862 LEGO M-Tron Secret Space Voyager
promotional
Value $38.71
Annual growth 3.4%

1478 Mobile Satellite Up-Link

Theme / Subtheme Space / M-Tron
Year 1991
Pieces / Minifigs 31 / 1
Availability Retired
1478 LEGO M-Tron Mobile Satellite Up-Link
Retail $2.99
Value $206.00
Growth  +6789.6%
Annual growth 8.9%

6989 Mega Core Magnetizer

Theme / Subtheme Space / M-Tron
Year 1990
Pieces / Minifigs 503 / 3
Availability Retired
6989 LEGO M-Tron Mega Core Magnetizer
Retail $59.99
Value $850.00
Growth  +1316.9%
Annual growth 7.8%

6956 Stellar Recon Voyager

Theme / Subtheme Space / M-Tron
Year 1990
Pieces / Minifigs 233 / 2
Availability Retired
6956 LEGO M-Tron Stellar Recon Voyager
Retail $35.99
Value $572.78
Growth  +1491.5%
Annual growth 7.1%

6923 Particle Ioniser

Theme / Subtheme Space / M-Tron
Year 1990
Pieces / Minifigs 203 / 2
Availability Retired
6923 LEGO M-Tron Particle Ioniser
Retail $23.99
Value $2,700.00
Growth  +11154.7%
Annual growth 10.2%

6896 Celestial Forager

Theme / Subtheme Space / M-Tron
Year 1990
Pieces / Minifigs 90 / 1
Availability Retired
6896 LEGO M-Tron Celestial Forager
Retail $10.95
Value $248.48
Growth  +2169.2%
Annual growth 6.8%

6877 Vector Detector

Theme / Subtheme Space / M-Tron
Year 1990
Pieces / Minifigs 62 / 1
Availability Retired
6877 LEGO M-Tron Vector Detector
Retail $6.35
Value $172.89
Growth  +2622.7%
Annual growth 8.0%

6833 Beacon Tracer

Theme / Subtheme Space / M-Tron
Year 1990
Pieces / Minifigs 40 / 1
Availability Retired
6833 LEGO M-Tron Beacon Tracer
Retail $2.99
Value $143.79
Growth  +4709.0%
Annual growth 9.4%

6811 Pulsar Charger

Theme / Subtheme Space / M-Tron
Year 1990
Pieces / Minifigs 26 / 1
Availability Retired
6811 LEGO M-Tron Pulsar Charger
Retail $2.99
Value $149.98
Growth  +4916.1%
Annual growth 7.6%