Produced by the iconic dive watch maker Squale, they produced some watches upon demand for external companies such as Blandford SA (Sub Aqua) which was a UK based distributor of diving equipment and watches. This example is particularly interesting as it features the Trident logo on the dial that actually covers an inscription (75 Atmos) showing that initially they were intended for larger cases before a mind change and integrated into the 25 Atmos models.