THE SERIE

Have you some of these bricks, slopes, archs, doors or windows (without Logos except the "pat pend" [patent pending] on the back side)???

Do you think, these are not-original-Lego bricks???

DON'T! This is original LEGO©

The LEGO "Minitalia" was a special serie available only in Italy during the 70s. Bricks are different from the normal Acrylonitrile butadiene styrene (ABS) bricks, but they aren't made of CA (the first material used for molding the bricks): the plastic is a lower quality plastic but it is lighter than the normal ABS and it was possible made trasparent bricks. The most relevant difference between the Minitalia bricks and the traditional ones, is the absence of the name “LEGO” on the top of the studs. I have a copy of a letter sent to a German AFoL where the Lego Group confirm the existence of the Minitalia branch. You can read it at this address (note that it is written in German!)
The brand was born due to many problems with the importing and the selling of LEGO items in Italy during the 70s.
LEGO made 21 different sets. The most important LEGO-related websites haven’t rather any informations about them: Brickset.com, Peeron.com and Lugnet.com ignore the existence of Minitalia sets. Some pictures are only avaiable from LEGO-fan-sites, like lucajuventino.altervista.org/lego/.
LEGO created two series of Minitalia sets. The first one during the beginning of the 70s (and it contains the greates number of sets) and the second at the end of the 70s (probably 1976-1977). This second is a little bit different from the first one because the boxes don't have any "Minitalia" logo and many parts are normal LEGO bricks. Only the windows and the doors come from the old Minitalia serie (in those sets they are black instead the old ones white). The "new" set #1 and #2 were transition sets: note that they, as all the other Minitalia boxes, contain for the first time a 1x4x5 door with four panes and a 1x4x3 window with shutters. Those sets were made of mostly with regular bricks with the addiction of the new types of doors and windows. The first 1x4x5 door, like the 1x3x4 window, was released during the 1977 as Peeron says (here a time table), like the windows (here the other table)
. It’s possible that the Minitalia doors and windows were used as prototypes in those last boxes of 1976-77.


These boxes show that the "minitalia" parts come from original LEGO sets. I think, "minitalia" is mostly unknown because it had few success due to the "bad" bricks. Today it's possible to find them in some old lot of Lego (by eBay or in some flea market in Italy).

Here there is the description of the Minitalia bricks, provided by Larry Pieniazek:

"Minitalia (you can read more about it on LUGNET) was a licensee of LEGO (similar to how Samsonite was here in the US)... their sets are badged both LEGO and Minitalia. Complex parts came from LEGO (for example, boat hulls) but simple rectangular parts and slopes and windows/doors were molded by Minitalia under license. 
ALL of their bricks have hollow technic style studs instead of the LEGO solid studs, but not all have X instead of tubes, some have (sometimes slotted) tubes instead. 
The Minitalia parts are of a different plastic, it's slipperier, somewhat duller and a bit softer. I dunno if it's still a styrene (unlike early Samsonite which is CA) or not. It's not LEGO ABS though, that's for sure. Some Minitalia bricks exhibit mild concave deformation on large flat surfaces, consistent with having cooled quickly and shrank a bit after being molded and ejected.  
I got a MISB Minitalia set once, which I opened, and unless the colors faded while in a non light exposed box, which I can't rule out, the colors are not as vivid as LEGO colors either." 

   

In the boxes there were some catalogs, which showed the other Minitalia sets and where it was possible read some "constructions advices" like those:

 

  ALL MINITALIA SETS

THE MINITALIA PARTS

MINITALIA SHIPS

 

If you have more information or want correct something wrong, please feel free to contact me.

 

I thank Gianluca Morelli for the background & pictures and Jan Katanek for the pictures.