Not being teribily helpfull are they?

What Para was trying to say is that the 21J has appeared in many forms from many factories. Some have been appaling quality but the ones used in most quality reps ie:most of the ones sold by pur trusted dealers are of very good quality indeed. The 21J currently used in the "noobmarriner" sub or Fakeys PVD specials is a great MVT. It is reasonably accurate, ajustment to withing a few sec a day should present little worry after judicial use of the search button here followed by some reading. It is tough, as close to indestructable as a mechanical MVT gets. I Know, I'v been proveing that point for the last eight or nine mths.
In short my test example has survived continious (allmost) wear for that time and has been subject to being worn with every thing from a jackhammer to centerfire shooting and worse. It hasn't missed a beat.
If the beat doesn't bother you (they beat slightly slower than a 2836) there's no reason to spend more IMO as long as the rest of the watch is the same as the high beat version.
How much do they cost?
Gen ETA (this is as cheap as a gen ETA gets, allmost def China made in ETA factory). 2836-2 $71.35
China 2813 or 21J $15.55
China ST-6 (also 21J) $13.15
All from
http://www.julesborel.com/
A real replacement Swiss Made ETA would be arround 130 to 180 dollars for a suitable MVT. Try Otto Frei, just don't annoy him or mention "replica"!
http://www.ofrei.com/page_181.html
Fakey prob wouldn't do a quartz sub for all the tea in China. He is however working on a quartz Daytona rep which, being a chronograph has a very small running seconds hand on a sub dial (the big second hand is the stopwatch seconds). This makes the ticking much less noticeable and thus acceptable to more people. For instance while I would not buy a quartz non chrono rep I would consider a 'tona or a Navitimer in Quartz.
The are sweeping quartz MVTs but they are rare and expensive. There is also the "tuneing fork" type of MVT which is a sort of hybrid between mechanical and battery power. They sweep but are also not cheap. Borel has some ETA ones ATM for 'round $235. Too big for most of our reps tho.
If you must have a Rolex go for a sub, either a "NoobMariner" from D4M or one of Fakey's PVD "Fakemariners" If you don't like the PVD i'm shure he would do a SS one for you. Neither of these will break the bank being about $110 for the noob and a little more for one of FMs specials but I think the quality will surprise you. The noob dial is still one of the best arroung and the rest of it is damn good too. Yet to hear a bad review on either Fakey's service or his watches and D4M you could trust with your life. Well, your watch collection anyway
Personaly tho I would go for either a Super Ocean Heritage non chrono or a Planet Ocean.
SOH. This with strap but strap or bracelet is your choice. With clone ETA about $220. Ask D4M if it can be got with a 21J.
PO. This is prob gunna be a bit more. 280 to 330 dollars seems the range, once again ask D4M what he can do. After CNY mind you.
Neither of these will be thought of as fake the way a Rolex automaticly is and both are lovely pieces, just a little dearer than a basic sub.
Hope that helps. Col.