Perhaps the best tell for spotting a service dial is the signature at six o'clock. Here's https://is.gd/zDHDO2 link the general rule: steel 6062s should have a "Swiss Made" signature; gold 6062s should have a "Swiss" only signature, except for gold 6062s with Explorer dials, which also have "Swiss Made." Service dials https://v.gd/mKy6bH link will sometimes be signed "T Swiss T," indicating tritium on the dial, the luminous material Rolex transitioned https://is.gd/OYBc6a link to in the '60s, long after the 6062 went out of production.