Ladies' Seiko Exceline tank 8420-5540 SGP30 plated with original seiko buckleMaker: seiko Model: exceline Material: plated Dimensions: 19mm x 25mm Crystal: glass Description & Condition report: one of the most important understanding to seiko collecting is to know the hierarchy of case plating and on the top percentile, we have the SGP30 cases, which meant that the case was plated with 30micron of real gold. And hence it was one of the top offerings on the catalogue during the 80s. A cool and simple cream dial variation. watch