The Buckmark is a newer version of the same design. Challengers came in 3 models or versions (I, II, III), each being made after the former was discontinued.
The Challenger III was very very close to the current Buckmark design, with the aluminum frame in common with the Buckmark. Challenger I and II both had steel frames.
This would be a Browning Challenger .22 pistol made in 1970.
50-300 usd
50 - 400 usd
100-400
Browning Challenger made in 1974. $300-$400.
1970
$300-$350.
100-250 usd
50-225 usd
50-300 usd
50-375 usd
"The Challenger II series .22 Caliber Pistol was introduced in 1976 and ceased production in 1982. The Challenger II evolved into the Challenger III in 1983." from: http://www.browning.com/customerservice/dategun/detail.asp?id=31