Arnold & Son’s new DGB Skeleton, the newest addition to its Double-Balance GMT lineup, has been unveiled just in time for Baselworld 2017.

This special DBG watch combines two movements into one case, with both sharing a winding system. Arnold & Son also decided to skeletonize the piece, too, for a view into its unusual mechanics.

Powering the DGB Skeleton is the in-house A&S1309 caliber, which features a 40-hour power reserve. This movement helps the watch account for time zones in 15-minute increments, making it possible to set the counter for certain Australian, Canadian, and Indian time zones.

Arnold & Son gave the DGB Skeleton a 44mm rose gold case, and a classic alligator leather strap. Only 30 examples will be produced, each priced at $38,850.