That is too broad of a question to answer. There are literally hundreds of models of guns that are 38 caliber.
Around 1961
Would need serial number to answer.
50 USD
100-500 or so
Colt police positive .38 serial # 113312 was produced around 1919.
There have been dozens of makers of handguns in Spain. Without knowing the markings on the gun in question, there is no way we can give you a good answer. .38 Special ctg is only the caliber of the gun. Sorry-
Try the sn tables at Proofhouse.com
you gun made about 1920. yes, you can use both 38 special or 38 S&W cartridges...
There are several manufacturers who make or have made firearms in that calibre, and cost varies greatly.
50-300 usd
It depends on what condition the gun is in,markings on the gun,and what the history of the gun is.
A firearm chambered to fire 38 special ammunition