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I looked through much of my database, and you don't see many Potosi 2 reales with assayer B (the PB on the left).
The one in my picture sold for $246 in a 2020 auction. Here is the auction description:
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Daniel Frank Sedwick, LLC > Treasure Auction 27
Lot number: 1621
Price realized: 246 USD (Approx. 224 EUR / 201 GBP / 239 CHF)
Potosi, Bolivia, cob 2 reales, Philip II, assayer B (2nd period). S-P6; KM-3.2. 6.28 grams. Very broad flan with much legend and crown, bold P-B and denomination ii, good full shield and cross, deeply toned VF.
($80-$120)===================
The auction house estimated $80 to $120. The $246 hammer indicates that this is indeed a rare coin.
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Moises --
I wouldn't worry about the VF30. That's a well respected grade for these old coins, and they stand on their own merits, no what the slab says.
Here is another picture from my database. This one sold for $2200 with the following description:
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Potosi, Bolivia, cob 2 reales, Philip II, assayer B (5th period), border of x's on reverse, Grade 2.S-P14; KM-3.4; Cal-370.6.00 grams.Finely detailed full shield and cross (the latter slightly off-center) with only very light surface corrosion on obverse, clear assayer B (certificate says assayer B/R in error), clear border of x's on reverse.With Fisher tag and certificate #94A-12438. From: Atocha, sunk in 1622 west of Key West, Florida ($1000-1500)...
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If you haven't talked with Daniel Sedwick yet, you probably should. He's the recognized expert:
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Hi again, Moises --
Back when I was dealing coins (30 years ago), I would send off gorgeous coins to the grading services, only to be disappointed with the resulting grades. I was very small-time (day job was as a radar engineer) and I carried zero weight in the numismatic community. Of, say, 100 coins I sent in, all but one disappointed me. The one coin -- I still remember it -- was a Martha Washington test piece, which graded MS66. All I was hoping for was better than AU. Haha!
Your coin is great. I like your new pictures and I like your coin's appearance in the holder.
Looking through my database again, there are very few 2 reales. Most are 8 reales. This one, however, shows up in a 2017 Heritage auction, realizing $420 US dollars. Not bad.
How my pictured coin grades VF25 and yours grades VF30 is kinda ridiculous. But such is life in small-time numismatics.