Thanks for the comments. I don't think it is a replacement line vial Scott, as the plaster bed for it looks original, and the vial fits like a glove to the top plate. Never the less, I have searched for many hours, and looked at all the Stanley Catalogs on the Rose site, many, many, past Tool Autions, Patent drawings on google, and datamp etc, and do not see a match for this "#011" level, which is my question here. The features I'm using to try and do a visual are the top cover plate, with 8 screw holes, as opposed to the typical 4 that I'm seeing on other close looking Stanley levels of the same time frame, and the 2 rounded half moon ends on the top cover plate, as opposed to being squared off, and the number 011 stamped in the body. All of this, along with the brass end caps, and dimensions of it. I was hoping someone had a recent copy of "John Walters, Antique and Collectable Stanley Tools" book, as It may show it. I'm begining to think that this particular model number was a hybrid, or had a very short production span if any at all.
Wayne