I had lost track of this old webpage of mine: http://www.doctorsax.biz/imperial_contrast.htm
1930’s Martin Imperial Alto Sax neck. Most modern necks have a tenon with a larger Outside Diameter (O.D.)
I don’t do much by way of valve brass, but I had a couple of sweet trumpets through the shop the other day. One was a 1930’s Martin Imperial trumpet. It has the Lion and Crown engraving which, in the sax world, I associate with the Committee II saxes.
The Lyre Screw is 6-40 The Receiver Tension Screw is 8-32 The Adjustable Thumbhook screw is 10-32
Martin Committee I (Searchlights) Alto Sax.
All the keys were extremely grungy. Here’s one “Before” picture: And here is after buffing: Still some pitting and scratches, but ….