Welcome Frank!
What a great old Parker you have! Your gun was made in 1874 and unfortunately we don't really know too much about these Dollar Grade guns because the records don't really tell us much in trying to grade them. The guns were constantly changing in engraving style.
As to the "B" prefix and the F.9.R, we believe they were inspectors marks but again, it's just speculation.
If I had to guess as to the Dollar Grade of your gun based on the barrel steel which is Damascus and the amount of limited but tasteful engraving, it could either be a $100 or $150 Dollar Grade gun. With the presence of the sunburst engraving on top of the bolsters, I'd say it's a $150 Dollar grade gun but it's just a guess.
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