The smaller Pin pallets can be fragile. Just the forces of adjusting the time on the clock may break them or stress the sockets so they can fall out.
If theres one pin left at least you know what size to make a replacement.
Yes these pins can be replaced, thinking yes they are hardened steel of a small diameter. I have had this happen to a small anniversary clock i had, cant remember what happened after it was repaired, thinking something was not right and my repair job, did not work out.
This is the reply I got: "Sorry I cannot get a photo of that without taking the top of the clock part and I don't have the tools to do it. But take my word for it there was only one pin on the Verge is missing."
I told him good luck.