Check out the auction sites - Gun Broker, Auction Arms, Guns America to see what prices are being asked. As to history of the 38ACP, have you done a web search?
50-200
As far as I know Hyde only made one pistol (Hyde Pistol) but it was Semi-automatic not automatic. It was made around 1959. In order to get an estimate of value you must state the current condition of the pistol from Excellent to Poor and is it still working?
I have a colt 32 automatic hammerless pistol and i would like to know the value of it.
50-500 usd
0-multiple thousands depending on EXACTLY what you have, any history and provenance it may have and condtion.
75-175 USD or so
what model pistol ????
50-175 usd
50-260
100-1000+ depending specifics
50-300 usd
about 1920 the value would depend of overall condition of pistol.