The Glashütte Original Senator Perpetual Calendar Boutique Edition was released in 2015, only available in boutique stores. It's a special version of the Senator Perpetual Calendar watch, featuring a stainless steel case and a unique blue dial with Roman numerals. The dial is made in-house at GO's facility in Pforzheim. The reference numbers 100-02-07-12-01, 100-02-07-12-30, and 100-02-07-12-50 come with an alligator strap and either a pin buckle, folding clasp, or short folding clasp. Reference 100-02-07-12-70 comes with a stainless steel bracelet.