If you keep seeing Eastman model names such as T59/v, T64/v or SB59/v, the /v designation is tied to Eastman’s Antique Varnish versions of those instruments.

What changes on a /v model?

The exact specification depends on the model, but current /v instruments commonly pair Eastman’s Antique Varnish finish with aged or relic-style hardware and vintage-oriented component choices. The underlying guitar still belongs to its normal family, so a T59/v remains a T-series 16-inch thinline while an SB59/v remains an SB-series single-cut.

What is Antique Varnish?

Eastman describes Antique Varnish as a hand-applied finish derived from its violin-making work. It is intentionally thinner and softer than a conventional protective topcoat, with the visual ageing forming part of the finish rather than being an optional cosmetic treatment.

Examples

T59/v • T64/v • SB59/v • E10OOSS/v • DM2/v

Sources: Eastman Antique Varnish, T59/v and current Eastman model specifications.