The Smith And Wesson model 66 is a 357 magnum caliber, 6 shot revolver of stainless steel construction

To disassemble the revolver, first remove the grip screw from the left side of the revolver as the revolver barrel faces to the left.

When the grips are removed the side plate will be fully visible.

Remove the screws from the side plate.

To remove the side plate, hold the revolver to the horizontal position with the side plate facing down. Do not pry off the side plate as that will damage the side plate fit.

Sharply rap the now exposed grip frame with a wood or plastic hammer until the side plate loosens. Continue to rap, and the side plate will fall off along with the hammer block, so be sure it falls on a padded surface.

At this point most internal parts will be visible and accessible.

The cylinder can be removed by sliding the cylinder crane to the left and out of the frame, while holding the cylinder in place.

The cylinder will now be free.

Removal of the extractor rod and extractor will not be described here, but the extractor rod is threaded in reverse to prevent loosening while operating. Caution: The extractor rod assembly is very often damaged in attempts to unscrew it. Also, it is necessary to support the extractor while unscrewing the extractor rod.

To reassemble the revolver, do the above in reverse, making sure the hammer block is in place and the side plate seats correctly.

You can tap on the side plate with a wood or plastic tool to seat it properly.

Replace the cylinder crane and cylinder. Be sure the correct screw is used to hold the cylinder crane to the frame.

Replace the remaining side plate screws in the correct place along with the grips and grip screw.

Holding back the hammer slightly, or with the hammer cocked, look in the gap between the hammer and frame to be sure the hammer block has been replaced.

A word of caution here: before making alterations or repairs know exactly what you are doing. Revolvers are delicate and expensive machinery.

If the gun is actually a S&W made gun, it is possible to get an accurate, free estimate by providing a picture of it, checking in at the smith-wessonforum.com.

There are about 100 models of S&W revolvers and many of them are available in .44 Special. There are also a lot of cheap knock-offs and expensive Colts marked "S&W .44 Special" because they are chambered for that cartridge. About the only thing I can say for sure about your handgun is that it was manufactured after 1907 when the .44 Special cartridge was introduced.

you can call S&W and give serial number and they will tell U date of mfg, but not value.

1-800-331-0852

None that will give you all the information available. Antique and Collectible Firearms and Militaria Headquarters has year of manufacture data for some. In many cases, even this information is not available as many manufacturers records no longer exist, and many firearms never had serial numbers as they were not required by law in the US until 1968.

The Remington Society of America is a dedicated team of enthusiasts that research all sorts of info on Remington firearms.

Proofhouse.com has Browning, Colt and Winchester models/sn's

There are a fairly large number of on-line firearm forums. Most of these have sub-forums that will allow the asking of questions about specifics of your firearm, that will be answered by quite a few knowledgable people. See links below for a few of these sites.