https://www.ebay.co.uk/itm/304668611357
Proverbial rocking horse droppings.
I probably should qualify that. The project watch will get a replacement pusher, but it won't necessarily be one of the two NOS pushers. I need to check though all my Cal. 531's to see if any have dinged or worn pusher buttons and might be more deserving. One watch that I can already think of, without checking, which will definitely be receiving one of the new pusher buttons is this F6424403, which I bought in October 2020 (full story here on the old forum). The badly discoloured plating of the 2 o'clock pusher button sticks out like a sore thumb.