Best left to a trained gunsmith
on one side of the grips there should be a screw. take the screw out nad the grips will come off
Loosen the grip screws.
Take it to a gunsmith
Best left to a gunsmith
You will need to find a gunsmith
A Smith and Wesson model 19-3 is a .357 magnum revolver, six shot, blued, the 3 means third change. To dismantle 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 3 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, so be sure it falls on a padded surface. At this point most internal parts will be visible and accessible. 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 screws in the correct place along with the grips and grip screw.
Please provide the serial number in your question to get a correct answer.
Smith & Wesson did not mark any revolvers "Secret Service Special." Exactly how is your revolver marked? sales@countrygunsmith.net
In typical condition, $150-$250
20-200 usd
50-1500 USD or so depending on specifics
Can't be answered without a DETAILED description of ALL markings, barrel length, finish, grips, sights, box, accessories, papers, condition.