Here is what Eastman say...
'A cap-less one-piece Okoume mahogany solid body delivers a lightweight playing experience without sacrificing an ounce of tone. The Antique Varnish finish found on both the SB55/v-SB and SB55DC/v brings the guitars’ visual and tonal beauty to the forefront. Our Antique Varnish finish is smoother than lacquer, with the thinner layer of varnish from our violin shop allowing for a fuller, more wide-open resonant sound that gives these instruments a truly unique voice.
Both the SB55/v-SB and SB55DC/v models feature a Lollar “50’s Spec” P90 in the bridge position. The lower output pickup produces a brighter and more defined tone with less distortion, creating room for more chordal articulation and playing subtleties to come through. This is perfect for players looking for a warm and growling sound that doesn’t sacrifice the details.
Premium Faber hardware, including a compensated Faber bridge for perfect intonation, provides the incredibly functional playing experience every player looks to find. The SB55/v-SB and SB55DC/v feature a no-load tone pot that bypasses itself from the signal chain when set to 10. When set below 10, it acts as a standard tone pot.'