[IDENTIFICATION] need help with this G Shock

Is there anyone who can identify the refernce number for this G Shock? It was a part of a G Shock lot I bought on eBay and is the only one I can't identify. No reference number on the caseback (see second photo). Looks to be an older Mudmaster? To be honest, outside of the Squares, my G Shock knowledge is lacking.

Anyone have any ideas? Would love to learn more about it.

P.S. This thing is a MONSTER. I measured it to be 57mm diameter (that's including the crown), and 19mm thick. It's compically large.

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I think it's fake. Casio always writes model number on the back and even google image search can't find this exact model anywhere.

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What's unusual is that Casio always puts the module number in a rectangular on the case back.

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I agree that it's odd since the module number is always on the caseback. I'm sure that one would fake a G Shock like this though. FWIW, this thing is built like a tank, and appears to be at least as tough as any G Shock I've seen. The built quality is intense.