March LA.B · Microbrand · France

March LA.B Mansart Petite Seconde

In production · Dress

March LA.B Mansart Petite Seconde Grall
Photo: March LA.B
  • March LA.B Mansart Petite Seconde Shelter
  • March LA.B Mansart Petite Seconde Golden Hour, 3-micron gold-plated case
From $2,071 to $3,362
  • La Joux-Perret G121
  • 35 mm × 11.1 mm
  • Sapphire crystal
  • 50 m water resistance

Movement

Type
Automatic
Tier
Premium
Complications
Small seconds
Frequency
28,800 bph
Power reserve
68 h
Hacking
Yes
Accuracy (factory)
—
Brand regulation
-4 / +6 s/day

Case

Diameter
35 mm
Lug to lug
39 mm
Thickness
11.1 mm
Lug width
—
Material
Steel
Hardening
—
Water resistance
50 m
Crown
—
Case back
Display, screw-down
Bezel
—

Crystal & dial

Crystal
Sapphire
Shape
—
Anti-reflective
Yes (side not stated)
Lume
—

Bracelet & clasp

Style
—
Links per row
—
Solid end links
—
Solid links
—
Link attachment
—
Taper
—
Quick release
Yes
Half links
—
Clasp
—
Micro-adjust
—
Diver extension
—

Straps

Strap 1
Leather, quick release, Leather options: alligator, lizard; tool-free "presto" quick-release system

Weight

Head only
—
On bracelet
104 g
On strap
59 g

Prices

VariantConfigurationTypePriceUSDAs ofSource
Grallsteel braceletMsrp2,095 EURincl. VAT$2,3522026-10-24link
Grallblack alligator strapMsrp2,095 EURincl. VAT$2,3522026-10-24link
Grallblack lizard strapMsrp1,845 EURincl. VAT$2,0712026-10-24link
Shelterblack alligator strapMsrp2,095 EURincl. VAT$2,3522026-10-24link
Sheltersteel braceletMsrp2,095 EURincl. VAT$2,3522026-10-24link
Shelterblack lizard strapMsrp1,845 EURincl. VAT$2,0712026-10-24link
Golden Houralligator strapMsrp2,995 EURincl. VAT$3,3622026-10-24link

Variants

NameDial
GrallGreen guilloché
ShelterWhite guilloché
Golden HourGold guilloché

About this entry

58% of key specs known. Missing: lug width, hardening, crown, lume, bracelet links, end links, link attachment, clasp micro-adjust.

Small-seconds Mansart (2025). Brand spec sheets: steel octagonal case, 35mm x 39mm (39mm lug-to-lug), 11.1mm, La Joux-Perret G121 assembled in Besançon (about 68h; hours, minutes and an octagonal small seconds at 7, with a stop seconds), horizontally guilloché dial, sapphire with anti-reflective coating, green-tinted skeleton screw-down caseback, 50m (stated on the Golden Hour sheet; Oracle of Time also gives 50m); 59g on leather or 104g on the steel bracelet. The brand claims a precision of -4 to +6 s/day, recorded as its regulation claim. The movement paragraph on the pages also says "G120" and repeats the G100's 24.6 x 4.45mm dimensions. Golden Hour: 3-micron gold plating, alligator strap; Oracle of Time's review says it comes with a second, dark green dial that March LA.B can swap in, and quotes $3,510 (approx. GBP 2,600). Lug width isn't stated. Prices are the French store's EUR prices as shown on the product pages, and they include VAT: the store's conditions générales de vente say prices are "toutes taxes comprises" at the VAT rate of the customer's country, and non-EU customers see ex-VAT prices only when logged in (the product pages add "Expédition et taxes calculées à la caisse"). Strap and bracelet options are recorded as prices with a configuration.

Last verified: 2026-10-30. Edit or correct this entry.

Sources