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We made use of the Gaia DR2 archive to comprehensively study the Milky Wayopen cluster Collinder 347, known until now as a very young object of solarmetal-content. However, the G versus G_BP-G_RP colour-magnitude diagram (CMD)of bonafide probable cluster members, selected on the basis of individualstellar proper motions, their spatial distribution and placement in the CMD,reveals the existence of a Hyades-like age open cluster (log(t /yr) = 8.8) ofmoderately metal-poor chemical content ([Fe/H] = -0.4 dex), with a present-daymass of 3.3x10^3 Mo. The cluster exhibits an extended Main-Sequence turnoff(eMSTO) of nearly 500 Myr, while that computed assuming Gaussian distributionsfrom photometric errors, stellar binarity, rotation and metallicity spreadyields an eMSTO of ~340 Myr. Such an age difference points to the existencewithin the cluster of stellar populations with different ages.

The extended Main-Sequence Turnoff of the Milky Way open cluster Collinder 347