As of 2022, all Tru-Tone bulbs are marked with a discreet logo near the base of the bulb, and "TRU-TONE" text is stamped into the brass collar of the bulb base.
Bulbs from 2021 have only the stamped base, and those from 2020 have only the logo imprint. See the table below for more detail.
Tru-Tone Bulb Identification by Year of Manufacture
Year | Discrete Logo on Bulb | Stamped Brass Text |
2020 | Yes | No |
2021 | No | Yes |
2022+ | Yes | Yes |