World Watch Material Hamilton 16s 992B Balance Staff - New

World Watch Material (Swiss) Balance Staff for 16s Hamilton 992B, friction insert, Factory No 659, new in envelope.  Yes, the envelope says 1/2 Doz but there is only one in the envelope.  Does have a small perplexing stain on the lower part of the staff (will not be visible when installed) but nothing that will impact functionality.  I specialize in hard to find parts and are sold with an unconditional guarantee.  Images do a suitable job of representing the item.