here's some hints from our friends on another site:
https://thefiringline.com/forums/archive/index.php?t-560401.html"SDC wrote
March 20, 2015, 07:18 AM
The Italian proof house has a book out called "100 anni di prove"/"100 years of proof" that shows this mark as belonging to a Sarezzo company called "Fusav di Bini & Baronio", founded Oct. 13, 1977, but I've got no other info on them. I hope it's at least a little bit of a lead."
and another from oour friend Prarie Dawg:
https://www.thehighroad.org/index.php?threads/1978-colt-navy-made-by-fusav-di-bini-baronio-ohio.778421/"
I have for sale a rare pistol, at least for USA collections.
It is a brass framed .36 Navy Colt that was made in 1978 by a short-lived company founded in October , 1977 called "Fusav di Bini & Baronio".
Only a few of their guns are still found.
Their mark iunder the loading lever is "BFB".
This one came to me as unfired, and I can find no evidence of this one ever having been fired.
The previous owner kept it in a display in his gun room.
Specifications:
Manufacturer -- Fusav di Bini & Baronio (Italy)
Date Code -- "AD" = 1978 date of manufacture
Barrel Markings:
Left side -- 36 Cal. Navy Model
Right side -- Black Powder Only -- Made In Italy
Bottom flat -- "BFB" (manufacturer's mark)
Caliber -- 36 (.380 round ball)
Barrel -- 7.5 inch octagon
Bore -- Excellent
Cylinder charge holes -- Excellent
Factory nipples
Engraved cylinder
Navy grips -- Excellent
Bluing is very good -- Some bluing loss in cylinder notches from bolt.
Just a super little 36!
......
--Dawg in Ohio
Prairie Dawg, Apr 17, 2015"
and somebody in the UK saved a single image from THR onto pintrest, titled
"1978 Colt Navy Made By "Fusav di Bini & Baronio" -- Ohio - THR"
-
I will add this one to my notes!
hope this helps
prof marvel