If this is the same one as you have in the picture in your listing on a certain auction site (Forum rules preclude me posting the link to the sale) the one in your picture there is a #21 protector.
yUZlnBQdp+TsM-g~~60_12.JPG)
(Mods, please remove image link if this also goes against forum rules)All the B-1's I have owned have had a #23 bezel protector fitted.
You may have had this fitted to your B-1 however, I would venture that whoever fitted it to the watch has fitted the wrong one.
My own search earlier this year for a #23 was successful and the new owner of my watch now has the #23 protector.
I am making enquiries as to which watch a #21 is fitted.
O2AFAC67 has an informative article at WUS
http://forums.watchuseek.com/f39/plasti ... 64976.html
Ron is also a member here and is extremely knowledgable on this kind of technical subject. As you can see from his listing (click link) he confirms the #23 for the B-1. (Possibly as he is also a B-1 owner).
If I find out to which watch a #21 pertains I'll update this thread.
Best regards
