La caja parece que fuera de aluminio

y la forma es bien de los setenta. Gracias por mostrar

:
Interesante para investigar ,aunque de entrada parece acero ya que su durabilidad seria la lógica a seleccionar por el fabricante nipon
aunque mira lo que encontré en la red.
[TABLE="width: 100%"]
[TR]
[TD="class: attrLabels"]Estado del artículo:[/TD]
[TD="width: 50.0%"]Usado[/TD]
[TD="class: attrLabels"]Marca:[/TD]
[TD="width: 50.0%"]Seiko[/TD]
[/TR]
[TR]
[TD="class: attrLabels"]Band Color:[/TD]
[TD="width: 50.0%"]Silver[/TD]
[TD="class: attrLabels"]Sexo:[/TD]
[TD="width: 50.0%"]De hombre[/TD]
[/TR]
[TR]
[TD="class: attrLabels"]Case Size:[/TD]
[TD="width: 50.0%"]40mm[/TD]
[TD="class: attrLabels"]MPN:[/TD]
[TD="width: 50.0%"][h=2]Does Not Apply[/h][/TD]
[/TR]
[TR]
[TD="class: attrLabels"]Lug Width:[/TD]
[TD="width: 50.0%"]19mm[/TD]
[TD="class: attrLabels"]Características:[/TD]
[TD="width: 50.0%"]Day & Date, 12-Hour Dial, Acrylic Crystal[/TD]
[/TR]
[TR]
[TD="class: attrLabels"]Estilo:[/TD]
[TD="width: 50.0%"]Deportivo[/TD]
[TD="class: attrLabels"]Movement:[/TD]
[TD="width: 50.0%"]Mechanical: Automatic[/TD]
[/TR]
[TR]
[TD="class: attrLabels"]Grupo de edad:[/TD]
[TD="width: 50.0%"]Adult[/TD]
[TD="class: attrLabels"]Water Resistance Rating:[/TD]
[TD="width: 50.0%"]30 m (3 ATM)[/TD]
[/TR]
[TR]
[TD="class: attrLabels"]Modelo:[/TD]
[TD="width: 50.0%"]6119-8480[/TD]
[TD="class: attrLabels"]Tipo de pantalla:[/TD]
[TD="width: 50.0%"]Analógico[/TD]
[/TR]
[TR]
[TD="class: attrLabels"]Serial Number:[/TD]
[TD="width: 50.0%"]195868[/TD]
[TD="class: attrLabels"]Watch Shape:[/TD]
[TD="width: 50.0%"]Oval[/TD]
[/TR]
[TR]
[TD="class: attrLabels"]Year of Manufacture:[/TD]
[TD="width: 50.0%"]1970-1979[/TD]
[TD="class: attrLabels"]Case Material:[/TD]
[TD="width: 50.0%"]Stainless Steel[/TD]
[/TR]
[TR]
[TD="class: attrLabels"]Water Resistance:[/TD]
[TD="width: 50.0%"]30 Metres / 3 ATM[/TD]
[TD="class: attrLabels"]Case Color:[/TD]
[TD="width: 50.0%"]Silver[/TD]
[/TR]
[TR]
[TD="class: attrLabels"]Country/Region of Manufacture:[/TD]
[TD="width: 50.0%"]Japan[/TD]
[TD="class: attrLabels"]Case Finish:[/TD]
[TD="width: 50.0%"]Gloss[/TD]
[/TR]
[TR]
[TD="class: attrLabels"]Band Type:[/TD]
[TD="width: 50.0%"]Mesh Bracelet[/TD]
[TD="class: attrLabels"]Face Color:[/TD]
[TD="width: 50.0%"]Blue, Ivory[/TD]
[/TR]
[TR]
[TD="class: attrLabels"]Number of Jewels:[/TD]
[TD="width: 50.0%"]21[/TD]
[TD="class: attrLabels"]Band Material:[/TD]
[TD="width: 50.0%"]Stainless Steel[/TD]
[/TR]
[/TABLE]