To identify the revision or the year/month the i1Display PRO has been manufactured then you can look the meter's serial number which is located on the sticker on the permanently attached counter weight.
Top sticker is from Retail i1Display PRO Plus while bottom sticker is from i1Display PRO OEM.
OE = OEM version, PL = Plus Retail, i1 = Retail
yy = short year manufactured, r-02 = hardware revision (A or B) - firmware version (02), xxxxxx = incremental number, mm = month manufactured)
As you can see hardware and firmware is exact the same. The same firmware/hardware have all the meters (OEM/custom OEM/Retail) from June 2015.
Just from January 2017 and later the OEM (or custom branded OEM SpectraCAl C6HDR2000) were rated for up to 2000 nits, just from the release of Retail Plus (rated 2000 nits) is not available 2000 nits meter to retail market, while normal Retail stay to 1000 nits (named as i1Display PRO).
My customers have confirmed that at September they have received OEM manufactured meters @ August 2019 also.
Ted's LightSpace CMS Calibration Disk Free Version for Free Calibration Software: LightSpace DPS / CalMAN ColorChecker / HCFR
S/W: LightSpace CMS, SpaceMan ICC, SpaceMatch DCM, CalMAN 5, CalMAN RGB, ChromaPure, ControlCAL
V/P: eeColor 3D LUT Box -
P/G: DVDO AVLab TPG
Meters: JETI Specbos 1211, Klein K-10A, i1PRO2, i1PRO, SpectraCAL C6, i1D3, C5