Color-period-diagrams in Johnson B − V and Gaia colors for Ru147 in relation to those for other relevant clusters. We see that Ru147 stars (green) are sandwiched between the 4 Gyr-old cluster M67 (purple), and the 1 Gyr-old cluster NGC 6811 (yellow, blue), as expected. The Ru147 rotation periods also connect smoothly to the rotation period data for the 2.5 Gyr cluster NGC 6819 (red), overlapping well in the G-K spectral range. We also display the distribution(s) for the younger (∼625 Myr) Hyades open cluster (black, gray). (See legend and text for references.)