ZF: High quality factory for most non-Rolex watches. Overall a good factory with solid releases. Just starting to branch into AP and RM, and they are pretty good.
Noob / N Factory: NOW CLOSED 🙁 Noob factory is probably the most famous factory among others, they started a very long time ago and really developing their piece of replica. Noob makes a decent submariner, but have a great Daytona with clone movement, and a good pepsi insert. Besides Rolex, Noob also developing some brands like some Planet Ocean Omega, Blancpain, some Audemars Piguet models, and some Panerai model. Recently (5/12/21) Noob was hit very hard in a raid so their models are on hold for ~6 months (rumor on timeline).
VSF/V6F/XF/HBB/KW: All fall under a common parent company, but VSF specializes in Omega and Rolex super-reps and Panerai, V6F does quite a bit of projects (though the name isn’t used much nowadays) and XF focuses on Audemars Piguet but recently ventured into Vacheron Constantin. HBB does Roger Dubuis.
ARF/JF: JF is the brand name of AP reps. High quality, great detail, though ZF is showing them a run for their money these days. JF also makes middle-high tier Rolex watches among others. ARF is a division that focuses on high quality Rolex releases that focus on finishing. Rumor that JF is closing.
JVS: Newer factory as of 2021, takes inspiration from VSF and aims to release high quality Rolex releases.
ZZF/Clean: Quality releases recently for Rolex. Rebranded to Clean factory. Be aware of fake
PPF: Supposedly family of ZF, but focused on Patek. Has the best current Nautilus
BP/GMF: BP is one of the OG rep factories. Has reps of most brands and models, and are at an affordable price. GMF seems to be a higher end brand focusing on finish, but sourcing from similar places.
MK/MKS: Focuses on IWC, Patek and Omega releases, though they have branched into other brands too.
TF: Specializes in tourbillons (hence “T” F), but most are 42mm and kind of thick.
GF: Originally started focusing on German watches (“G”F), but have branched into many other Swiss brands like JLC and Cartier. Creates ‘copy cat’ models for a bit cheaper, and sometimes surprises with improved details
FK: Makes quite a few reps, most are not very good or just barely miss the mark for one specific reason. However, their Breguet 5177 v3 watch is superb!!! So do not underestimate any release of theirs.
JKF: Joker Factory
R Factory: Rolex
YLF: Connected to ZF, focuses on IWC
VRF: Specialized in the Rolex arena with an excellent sub, excellent new VR3135 movement, and gold wrapped subs too.
OMF: Focuses on middle tier quality and prices, but recently have high quality Omega releases
PF: Revolutionized the Nautilus market with the first thin Nautilus. However, they were recently outdone by PPF and 3K. Focused on Patek, but have other releases.
3K/BTF: clone Patek movement releases and excellent Daytona reps.
JJF: Focused on Vacheron and Patek releases, came out with the great Overseas rep. Rumor is they shut down though.
TTF: Higher end Entry tier quality watches.
GDF: Higher end Entry tier quality watches.
TWF: Taiwan Factory. Specialising in Cartier but with a number of other watches for low prices but decent quality.
Gold Factory: Mainly make Rolex reps
APS: Rolex & Audemars Piguet
8848F: Make a lot of Cartier watches