Originally Posted by Bianchigirll

I see a 531 decal, can you tell us the bottom bracket threading? What size seat post? Anything stamped on the dropouts?

It's possible, I think, that someone could put a hole in the tube to match up with a hole in the lug but why? It might weaken the frame and even if you expoied some sort of gem in there you run the risk of it falling out and then the frame can get dirt and moisture in it. Others will correct me if I wrong but I believe putting a hole in the lug is not only decorative, and helps identify the builder in some cases, but it aids in getting the solder flow through the joint better.

ALso why go to all that trouble and not put a makers mark of some type in the seat stay caps and fork crown?