Collectability and value, revolve around several things. Most of which are nib, pristine condition and scarcity of numbers, or special issue. If I read your post correctly, this is a used weapon and general mfg issue which does nothing to enhance collective value.
Used like new Cobras will range in the $400 to $500 range in .357 mag, maybe a bit less for the .38 spec model. In this day of the automatic this is a respectable resale price. Judge your options accordingly