Not an expert, however I learned much through my 9' Sport King
which is also a 55-59 model.
The formica rails came out in 1955 per a very rare Brunswick catalog
I have for the 1959-1960 season.
The emblem on your table was last seen on 1959 models, as the 1960
models all had that
"B" symbol on them due to the corporate
change from Brunswick-Balke-Collender to just Brunswick.
There is a pool room in Salem, Oregon called Cue Ball that features
exclusively Anniversary and Centennial tables. The owner, Jim Lebold
is an expert on this subject and he told me that the 55-59 models
were the best ever produced.
Good luck with your sale.