Casio MD-730 - maybe a Marlin?

Today's watch is another Casio, and an intriguing one.

The watch is a Casio MD-730, and is one of the simple Casio Divers watches. The MD series all seem to be divers watches, but there isn't much online about them, although what is there suggests a 90s release. This model, the MD-730, has very few hits online, so I don't know too much about it.

It is a typical 3 hand dial design with day and date at the 3 o'clock position, and a rotating bezel. It is 20 bar water resistant, and has a screw down crown unusually at the 4 o'clock position. Inside is a 709 module which was used in many watches, and is part of a common Casio Analogue multi-module manual.

The intriguing part is what is engraved on the back. The back plate features an engraved picture of a sailfish which is the same as printed on the Marlin watches. This fish is in a slightly different pose than the Marlin logo, so I don't think this is a Marlin model, but it's interesting that is uses the same fish for its logo!