The Seiko Almanac · by Tiny Hour Tales
Model reference

Seiko 90ST

stopwatches (ストップウオッチ) · catalogued in 1967

Case
ACRP
Jewels
7
Dial
Basket ball, 30 s scale
List price
¥9,000 (ACRP)
Seiko 90ST as pictured in the Seiko JDM Catalog No.2, page 30
From the 1967 Seiko catalogue, page 30View Page

Identifiers

Case–dial code
504-500

From the catalogue

Dial
Basket ball, 30 s scale
Case
ACRP
Jewels
7
List price
¥9,000 (ACRP)
Specs
stopwatch · basketball (30 s)

セイコーストップウオッチ (Seiko Stopwatch); バスケットボール用; 特殊ストップウオッチ(90ST); no model number printed, only the symbol and the case–dial code

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Not this reference or caliber — simply the Seiko-family watches available today.