As with any firearm, it is not possible to accurately appraise a gun without seeing it. Condition, and original configuration will determine value. Other factors such as rarity of caliber or guage and higher grades have significant impact on value. Recommend that you see a local gun dealer for an appraisal. You can also do your own investigation by looking at other models being sold that are in the same condition as yours. Try the gunbroker.com or a periodical called "The Gun List" You can also reference the Blue Book of Gun Values which can be purchased on line at various retailers.
50-600 usd
They refer to this handgun as the browning model BDA (browning double action auto) pistol.
1983
Contact Browning.
yes
9x18 is the Makarov cartridge. Browning never made a firearm chambered for it. They did, however, make such a pistol in 9x17 - otherwise known as the .380 Automatic Colt Pistol. It was actually the Beretta 84 'Cheetah', badge engineered and marketed as the Browning BDA 380.
50-500 usd
1933-34
Ridiculous
As of July 2009 Browning BDA 380 double-action pistols in near-fine condition sold for an average price of $925 in Florida, Nevada, and Georgia. I found one in March 2010 for $499.00 in near-mint condition.
.355.
$300-$350.