Ambrosio "Super Lusso" bar/stem

[Jesper]

I have this Ambrosio integrated bar, stem and levers that I am trying to determine an approx. time frame of manufacture. There is no example in velobase that matches; separate "Super Lusso" stem, but different design dated 1948 (I'll add this example). The bar, stem and levers (solid) are aluminium. The lever mount is steel and is integrated with the grip. The bar attracts a magnet at the middle of the clamp. I assume it is a 2 piece bar with a steel tube connecting each side of the bar.
Width is approx. 49cm c-c at the grip ends, stem is 60mm.
There appears to be an "8" stamped into the top of the stem near the steerer bolt (see photo #5). I don't know if there is any significance to it; possibly a year ('48 or '58?), but definitely not size related.
The grip appeared, at one time, to be riveted or screwed onto the bar, but neither side has that hardware. You can see a slight hole where it appears that the grip was rotated out of alignment with the hole in the bar (see photo #7).

 

[dnc1]

"8" may be the model number for this particular style perhaps?

 

[juvela]

"8" may be the model number for this particular style perhaps?

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more likely the extension dimension as measured in cm's

subject example relatively late within context of product's production life

earlier production had a two-part hand grip with the forward portion being celluloid or injection moulded plastic and the rear portion being bone

here is another type dated 1949 by its owner/researcher

this one exhibits differing handgrips and brake levers

its bar is fastened in place with a traditional pinch bolt

four images commencing here -

tiny.cc/8zjbvz

https://flic.kr/p/2hL572Z

this one is termed a submodel Torino

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[Jesper]

The stem is 60mm so the "8" must refer to something else. I assumed early 50s, but just a guess. I had never seen the one piece molded grip so figured that it might be a good way of dating it.