By "good' I assume you are familiar with the NRA grading scale, that runs from Fair to Excellent. The "Good" grade would run around $150-250.
A Colt 38 police positive serial no. 357606 was made in 1932 and has some worth, but value is depending on overall condition
value depends on overall condition. if your colt is a police positive special, made about 1921
value depends on overall condition.................
value depends on overall condition..............
made about 1904. In 32 cal. value depends on condition
over all condition and when made
value depends on overall condition........................
value is based on overall condition............
value is based on overall condition............
value depends on overall condition
made about 1913. value depends on condition
value depends on overall condition.............................