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From what I could find it appears you may have the Sig P220 BDA which was originally produced for the Swiss Police and Military.
They were made from 1977 to 1980 in 3 calibers.. 9mm, 38 Super and 45 ACP. They had many of the features of the early model Sig P220's.
On a side note, the Browning BDM is a pure bred Browning developed for the FBI service trails but ended up in the commercial market. Different sources say it was produced between 1991 to 93 while others say 91 to 98.
I have 3 of the BDM's and there are superb handguns but were only made in 9mm Luger. They have a slimmer grip than the Browning Hi-Power and originally came with a 15 rd magazines.
My wife loves the BDM because it fits her small hand better then most pistols.
The Browning BDM is unique in that it has a 'selector' switch on it which the user can convert it from DA/SA or DAO.
In the photo you can see the selector on the back of the slide. It is marked P & R. The R is DAO and was considered a transition for LEO's changing from revolvers to auto-loaders but Glock hit the market at the same time and the BDM finally went the way of the Dodo bird.
The last time I found Browning 15 rd mags the asking price was $150.00 each but 10 rd mags are somewhat available.
The 2-tone Browning in the photo is called the 'Practical'. I have one and my wife's is standard black finished that has since been 'wrapped' according to her taste. I'll have to find a photo of it...it is interesting.
Back on topic.... I have an early 'All Steel' model of the P220 stamped "Made in W. Germany"