Miroku name is less known/recognized here than abroad, so worth something less(?), yes.
I'd be more interested in the gun's condition and the specification(s) meeting her need(s) for intended use.
There are more than one method of the forearm attaching. All work well enough, earlier versions were more labor intensive to build, not less reliable. No down side to early, it just takes a few moments longer to assemble.
Plan on eventually replacing a main spring if the gun is going to be used a lot, IMO some of the earlier guns did not quite have the spring temper correct for infinite durability, only a few tens of thousands of rounds.. and I do not think it makes a bit of dif. it the hammers are left cocked or the springs are unloaded when the guns are stored. I've seen people have a spring break both ways; the common factor being LOTS of use!
More than you asked, but they are good value if not abused.
