Just arriving from Italia are these 2 incredible small insulators.

The insulator on the left is a MIVA BT 3S ( reverved s) in a nice light yellow. The insulator on the right is a MIVA PYREX and the inner skirt has damage. The embossing on the other side is weak and I need to place this insulator under the microscope to read the model of this small glass.

The Pyrex insulator has a longer inner skirt than the MIVA BT 3S. The outside of the MIVA PYREX has a sort of haze or fuzzy effect on the lower outer bottom skirt. I am not sure if the is a CD assigned on the MIVA PYREX but this may also fall into the CD 677.X catagory.