The Bigsby B7 was added later. The model number is 85 or higher because the pegs are GROVER, but the paint seems to be relatively thin, so it might be 100, but I don't know the details. Subjectively, I think the sound is good.
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All guitars equipped with a Bigsby B5 or B7 vibrato suffer greatly from reduced frequency response and sustain because of the complete lack of quality of the front roller of the units. Callaham's upgrade kits provides a solid, stainless steel front roller and axle that will greatly widen the frequency response and sustain.
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Callaham Guitars has crafted a solid stainless steel front roller and axle that will widen the frequency response and sustain of your USA made Bigbsy B5, B7, B12 and your Fender B5 Vibrato. This simple retrofit will greatly enhance the tone of your Bigsby Vibrato.
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Vibramate V7-LP Kit includes the Vibramate V7 "Dogbone" mounting plate with felt-pads on the bottom for a soft touch to the top of your guitar. Make sure you have the correct Bigsby Vibrato for proper installation of the Vibramate Kit!
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eBay
NEW - Bigsby B7 Vibrato w/ Tension Bar. The B7™ is a combination of a B3™ and B5™ and features a tension bar to increase the break angle over the bridge. Designed for archtop solid body and semi-hollow body guitars including Gibson® Les Paul™ Standard/Custom, and Gibson 335.
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eBay
eBay