Update (March 2022): The MRG-B5000 series was officially announced. See Titanium G-Shock MRG-B5000 with Cobarion bezel is official: MRG-B5000B-1 & MRG-B5000D-1 launching in March
Japanese fan blog Great G-Shock World reported on the discovery of an upcoming G-Shock MRG-B5000. The original source was not revealed, but it will reportedly cost at least 300,000 yen and will likely be the highlight model of the 40th anniversary in 2023.
(Update: Great G-Shock World reported that MRG-B5000 will launch in August or September 2021. The source of this information is not official, but GGW believes it is a reliable source.)
5000 models hold a special place in the G-Shock lineup, as the first ever G-Shock from 1983 was the DW-5000, and current 5000-5600 series watches still use its iconic “square” case. Current 5000 models like the GW-5000, GMW-B5000, and DW-50XX anniversary edition are special origin tribute models, which feature a stainless steel inner case and screw-back like the original DW-5000.
The MR-G series is the top of the G-Shock lineup and features watches made of a specially treated and hardened titanium. Though early models included all-digital displays, it is now a luxury analog line. The MRG-B5000 will presumably be a return to an all-digital display.
The MRG-B5000 is expected to be the peak 5000 model (excluding the limited and solid gold G-D5000-9). It’s hard to imagine what will set the MRG-B5000 apart from a GMW-B5000. We assume that it will be made of hardened titanium with a DLC coating, but what else will justify a nearly $3,000 price and a move to the MR-G line?
Keep in mind that we do not know the certainty of this watch being released or the reliability of the original source.
Update: Great G-Shock World later reported on rumors that the MRG-B5000 will use the same TranTixxii titanium alloy as the GMW-B5000TR-9 and will also have a multi-color design like that model. Again, we have no idea how accurate or reliable this information is.
The MRG-110T-8 was one of the first full metal MR-G models from 1996.