GM (also written GMF) is a generalist label that appears on Rolex GMT-Master II and Datejust listings, and is one of the names commonly suggested when buyers ask which factory builds those lines. Like most labels in this trade it has no published test behind it: the only structured factory comparison this site could find covers the Submariner, and it does not include GM. Treat it as a listing label.
On this page
Is GM Factory still making watches?
A generalist label seen on Rolex GMT and Datejust listings in dealer catalogues. This profile carries 1 reported brand line, 2 signature references and 1 cited source, with 2 open questions listed below.
What is GM Factory known for?
This page records 2 points of note for GM Factory, alongside 1 reported brand line and 2 signature references, while what the trade repeats without a dated public document is kept separate further down the page.
- Rolex GMT-Master II and Datejust references
- Being recommended by name in community discussion despite having no published measurement
Which brands does GM Factory build?
The trade associates the GM Factory label with 1 brand line, listed below; the source for the mapping is cited at the foot of this page.
- Rolex — GMT-Master II and Datejust references
Which models is GM Factory known for?
This profile lists 2 signature references for GM Factory, each resting on a listing observation or a cited test, with its basis noted beside it and its sources at the foot of the page.
- Rolex GMT-Master II — The line the label is most often attached to in community discussion (Community attribution (forum and dealer listings), not a published test)
- Rolex Datejust — Also attributed to this label (Community attribution (forum and dealer listings), not a published test)
What has not been verified?
The following is commonly repeated about GM Factory in the trade, and none of it is documented in public, so this site leaves it as unknown. 2 points are carried below as open questions, each one waiting on a dated source before it can be stated as fact:
- Production status, ownership and movement supply
- Any quality claim — nothing published measures this label
Sources on this page
This profile rests on the 1 source listed below, dated and linked where an original exists, and any claim about GM Factory without a dated public source is carried above as an open question.
- market observation · 2026-09-23 · Factory labels observed on third-party dealer listings, snapshot 2026-09-23
Reviewed 2026-10-01. If a source here is wrong or has been superseded, the correction is published on this page. See About.