I have a 4 screw mdl. 27. The numbers on the cylinder, star & frame match. There is another number under the crane & at the bottom of the grip frame. Serial # on frame S2093xx.
The number under the crane & on the frame bottom is 1075x. What is this number for? Thank you in advance for your knowledge.

You have a rare one there. What length barrel?
It was made in 1960. The serial number is always on the bottom of the butt. The other numbers are assembly numbers and are not of any use to us, since we have no idea what they mean. They were only important when they were putting it together.
Jim

Assembly numbers were stamped on the yoke, frame, and possibly the side plate (I have not taken one off to look). The parts were fitted and stamped with the assembly number so they would be kept together during subsequent steps in manufacturing.

Bill

The sideplate, frame and yoke got the so-called "soft fitting" numbers early in the production process. They were meant to identify associated parts of a specific firearm that would be separated later to permit further assembly work on major parts. When all parts for a particular handgun were marked with the serial number for the gun and given their final assembly, the soft-fitting numbers became irrelevant. As the numbers had no long-term importance, they didn't need to be more than a few digits long; these temporary numbers could be repeated without confusion once the last gun to use those numbers was finished and sent to inventory.

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David Wilson

Thank you for the info. The 5 digit # was on the side of the lower part of the grip frame. Sorry to confuse you all. The gun has a bunch of surface rust like it got wet in the holster. I bought it 20 years ago in a pawn shop for $200. I will get pictures as soon as my wife breaks out the camera. I am talking a trade & will want to know the relative value. I know no pics no value.