Can anyone help identify a verge for the following: verge (fork) is for a BOSTON spring clock movement. There were two numbers on the movement that my friend read to me:

B7906

and a number he said was for a pattern (what ever that means) 281880. He did not think that last number meant anything.

I do not have the clock nor any other info.

It may help to get an answer if you could post a photo. Is that possible for you?