There is not a lot of information on this very inexpensive copy of the Remington derringer. The company seems to have been active in Ft. Worth Texas during the 1960s-1970s.
About $50. These are not high quality collectable firearms.
40-100 USD
50-260
I THINK your derringer may be a RECK. Value about $25-$50.
50-260
20-40 or so
$75
10-50 usd
$75
10-100 usd
50-80