Two terms are commonly used with top condition Mercurys:
"FB" (Full bands) and "FSB" (Fully Split bands).
In my opinion "FB" is a much better term, because it implies that the bands are fully struck up and completely unworn. The bands will have a rounded top to them, much like the crust top of the old style of a loaf of bread.
The implication of "FSB" is that the bands are fully split; that implies that as long as they are fully split, that is OK. Such split bands can still have some wear on the top of the bands allowing a flat top to them, or they are not completely struck up, thus resulting a flat top to the bands.
I have both "FB's" and "FSB's" in my collection, the "FSB's" with and without any wear.
"FB" (Full bands) and "FSB" (Fully Split bands).
In my opinion "FB" is a much better term, because it implies that the bands are fully struck up and completely unworn. The bands will have a rounded top to them, much like the crust top of the old style of a loaf of bread.
The implication of "FSB" is that the bands are fully split; that implies that as long as they are fully split, that is OK. Such split bands can still have some wear on the top of the bands allowing a flat top to them, or they are not completely struck up, thus resulting a flat top to the bands.
I have both "FB's" and "FSB's" in my collection, the "FSB's" with and without any wear.

























