Firenze GL5000 [15spd to 10spd] conversion

- found in residential street corner leaning against a tree near Golden Gate Park on a sunny Tuesday afternoon.
- judging from the original condition, I concluded the bicycle was in someone's bushy/jungle-ish backyard for a long while until the owner decided to just leave it outside, hoping someone would take it away.
- converted into a 10 speed because I do not know how to put back on the original triple chainring cottered crank.
- original everything except front wheel, dropbar/tape, pedals, & some wires.
- was a post-apocalyptic POS when I found it (lots of cleaning/scrubbing).
- found a big-ass spider and its webby lair inside the original dropbar (lots of stomping afterwards). [found a total of 5 spiders of different sizes in between the two days of bike cleaning, around the bike cleaning area]
- very ugly bike when seen close-up.
- surprising light compared to other old 10spds (but then again, I took off the non-working kickstand)
- sprayed painted each end of the bike with a little bit of silver color to make the bike look better.
- rides pretty smooth and quiet now.
- contemplating converting it to a beater fixed gear when have time/money.

- I've looked online to find out more info on the Firenze, and found sparse detail of it back in the day being giving away with each new car purchase in Daly City somewhere. Can anyone who knows anything about it expand or give me more detail of the history of the Firenze?