Compilation of Ruger Mini-14 descriptions & pictures into convenient & easy to browse form.
(contents - so far - copied from Satan2655 and mlfox from PerfectUnion.com)

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For those of you with fast connections, click HERE for the full-size image page. (includes more pics from mlfox)

Masen	Ruger	Scherer	Precision MAG Industries (PMI)	USA	Ram-Line	Western

And a singular pic of a Millet:

Specific Identifying Features of various mags:

The following photos show special identifying characteristics of note:
Masen 
One punch for retaining floorplate.
Rounded corners on mag catch, and dimple outward on right side of mag back side (as viewed by shooter).
Deep cuts in front of magazine lip by bullets, nicely rounded curves to save your fingers.
Ruger:
Distinctive "Ruger" logo stamp on floorplate.
Dimple outward on Right side of mag (as viewed by shooter).
"RUGER" Stamp on mag body.
Scherer:
"Mini-14" stamped on floor plate, two plate retaining dimples.
Dimple outward on LEFT side of mag back side (as viewed by shooter).
Closeup2, Closeup3, Closeup4
Precision:
"Precision MAG Industries" logo stamp on floorplate.
Two plate retaining dimples.
Another Closeup
USA:
Single, clean plate retaining dimple.
Magazine retaining hole area stamped somehow with a square device, and often quite marred from inserting and removing magazine. I found that the retaining pin does not actually go into the hole, but rests against the part that is scuffed up.
RamLine:
Back side of magazine is open for 1.5" on the back.
Front retaining hole.
Markings on magazine indicating number of rounds loaded.
Magazine loaded with Wolf Ammo.