Northslope-
Your gun points out exactly what I told the OP, both here and in the other forum.
You said your gun is a
standard Classic. Look at how close the end of your rear sight tang comes to the step down in the topstrap. It's the same as the
Classic DX in the OP's post. Look how much farther away from the same step down in the top strap it is on the 629 standard Classic.
Like I said before- not an issue relating soley to the DX's. The early ones for the original Classics and Classic DX's were longer, the later version is shorter.