piano chord
Am6
A1C♭3E5F♯6
A minor triad with a major sixth added, which is why it is not simply a minor chord with a flat seventh.
What is true of it
Am6 is A, C, E and F♯ — 1, b3, 5 and 6 counted from A.
These are also the notes of F♯m7♭5/A and G♭m7♭5/A. Which name is right depends on what is underneath and what came before — the notes alone do not decide.
On an instrument that cannot reach all 4, the 5 goes first, in that order.