TAG Monaco Asian 21J / quartz
We constantly hear the question: "Why there's no great replica of this legendary watch?" The answer is that the Monaco uses an ETA 2894 movement, a movement that has seconds at 3. There's the new "seconds at '3" Asian Valjoux 7750 "hack", but I doubt it could be adapted for this watch.
So it looks like Monaco has the same problem as the another highly requested TAG, Autavia. There simply isn't a way to replicate it properly (with the current available rep movements). But there have been rather nice faux chrono 21J and quartz versions. Usually, I'd usually choose a working quartz stopwatch over faux 21J Asian. But Monaco is a bit special watch, and it doesn't visually resemble a typical, traditional sports chronograph. Simply for this reason I'd choose the the faux 21J for Monaco. I can imagine that the constantly running "stopwatch" hand wouldn't bother me on this watch. And besides, having a quartz-powered Monaco sounds just, well... rather silly. This just my personal recommendation between the two versions, nothing more.