I have observed screw in and drive in pushers fitted to this reference.
Here are two pairs of pushers, the taller pair from a 145.022 and the shorter pair from a 105.012. You can see the screw threads on both pairs.
I am pretty sure both pairs are service replacements, (which is why I replaced them on the watches they came off).
I need to look closer at pushers.
Paul sent me a little upgrade to his wonderful opener:
This is the Aluminum one, and the rubber collar gives some grip. This certainly adds to ease of use.
Order this by clicking on the link on the left, or here
If you ever want to open a case back, use this tool – works on many other references too.
When buying a calibre 321 we need to check the column wheel integrity.
Here is a 321 movement:
Check for this:
A small selection of very rare original dials.