US Revolver Company was a trade name used by the Iver Johnson company. It was a less expensive line they offered (primarily through mail order) starting in 1911. Reportedly they began by using up left over "Old Model" parts with the introduction of the "New Model" Iver Johnson top break revolvers. They sold well and remained in the product line into the 1930's with the various versions slowly fading out and a final cleanup of production @ the start of WWII. They also offered the brand on versions of the solid frame revolvers that were based on the IJ Model 1900 design.
The US top breaks do NOT have the Iver Johnson transfer bar safety system and should have an empty chamber under the hammer for safety if carried. They also lack the positive cylinder lock of the New Models so the cylinder will freewheel when the hammer is down. The internal design is simple, identical to the earlier IJ Old Model except for the transfer bar parts. All springs are leaf springs, the most common failure I've seen is a weak or broken trigger return spring. Takedown isn't hard but a slave pin is required to get the sear bar reinstalled easily. You might be able to find an exploded view on line, perhaps at Gunparts Co. I went on an IJ collecting jag some years ago and they really aren't very complicated. They were a decent, inexpensive revolver in their day, many were used hard and worn out but it's not uncommon to find one that spent most of it's life in someones sock drawer. They can be fun little guns to plink with.
