This is the Screw In Type Steel Pusher fitted to the Speedmaster Moon Watch 105.012.
These are Omega supplied service pushers for the calibre c.321.
Case references as stated above.
 
Specification

5.00mm x 2.50mm x 9.25mm. 
Push In Type.

Omega Speedmaster 086ST0007 Moon Watch Pusher Steel 105.012 c.321

SKU: 086st0007
£89.99 Regular Price
£79.99Sale Price
  • Items can only be returned if either faulty, in the case of the item not being required then it must be returned exactly as received. For example if the item is new in a sealed packet and/or has protective covers in place then it must be returned the same otherwise item is no longer new and the value is greatly reduced, these items can only be returned/refunded by agreeing a lower value with Swiss Limited Editions before returning reflecting the new lower value of the item.