Hi,
With a serial number in the 39000 range it isn't a model 27. Make sure that the serial number you have given is on the butt of the revolver. If taken from other places it could b an assembly number. A 357 with that serial number predates world war ii and if 357 caliber would be a registered magnum or non registered magnum. Both of those would be considerably more valuable than a model 27. Look in the crane opening and see what it says there. If it has the letters reg and a number it is a registered magnum which is the holy grail gun of a lot of the members of this forum.
Mark