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50-300 USd
Browning.com has a sn function under customer service.
10-1000 usd
100-1000 usd
Browning has sn data on their website.
1969; 200-400 or so
The Browning web site has sn data.
Browning.com has a sn function under customer service. Go to "Dating your firearm" on their site. Your Browning Challenger was made in 1966. You can go to Browning as suggested above to look all this up, but SN's were followed by a U denoting Challenger Pistol and a single digit from '62 to '68, then a two digit year was listed from 69 to 75, when they then started the Challenger II and III series. Those were denoted by the prefix 655 and a two letter code denoting the year. You have to go to the Browning site to look those up.
100-500 USD depending on configuration and condition.
You must provide the sn or call Browning and give it to them.
Browning's web site has a sn search function.
Browning.com has sn data on its website under customer service.