It looks like I found the right place to find out some info on 2 S&W revolvers I was given many years ago. These belonged to a collector till he passed nearly 20 yrs. ago. One is a 3" barrel model 36 with a serial #266xxx. The other is a model 64, 4" barrel in the box with the brown paper, registration card and service center address paper, serial #D504xxx. This appears to not have been fired. I would like to find a value for both of these guns. What would be the most reliable method? Any input will be appreciated.