Following up with its exclusive collection of blue-coloured watches, the Bucherer “Blue Editions”, which include some pretty cool watches such as this Oris Chronograph or this Breguet Marine, major Swiss watch retailer Bucherer continues to expand its line-up with a high-end piece, this time in a limited edition, with various evolutions compared to the standard model. Say hello to the Glashutte Original Senator Excellence Perpetual Calendar Bucherer “Blue Editions”.Apart from introducing some changes to the dials or the straps, the common denominator of (almost) all the Bucherer “Blue Editions” is the use of specific blue dials – or blue details, such as the movement side of this Moser. This was the case when this whole concept began, however, as interest grows, the Swiss retailer has started to make some more dramatic changes on these watches – see the dial of this Breguet for instance, more than just a colour change. Ad - Scroll to continue with article With its latest watch, a special version of the Glashutte Original Senator Excellence Perpetual Calendar, Bucherer has undertaken some design innovations. Indeed, this watch, in its standard edition (as we reviewed here), has a silvery-white dial with Roman numerals and blued hands. For its version in the “Blue Editions” series, the Senator Excellence first gets the traditional blue treatment, with a specific “Bucherer Blue” tone over a grained surface – a superb dial, manufactured in-house by GO. The rest of the perpetuall calendar display remains the same with a Panorama Date, the day of the week, the month, a moon phase and leap year indications.The dial is also highly modified; the Roman numerals have been replaced by more modern and more casual metallic applied markers and the rhodium-plated hands are now lance-shaped. Altogether, the watch feels rather different and this dial complements the rather large – 42mm diameter – stainless steel case and the rubber strap – also specific to this edition, with its folding buckle and a “Bucherer 1888” pattern.Powering this Glashutte Original Senator Excellence Perpetual Calendar Bucherer “Blue Editions” is the same in-house, chronometer-certified calibre 36-02 as found in all the other editions of this watch. This automatic movement is modern – silicon anti-magnetic escapement – and powerful, with a solid 100-hour power reserve. Its decoration is in the vein of Glashutte Original’s production, meaning detailed and pleasant.The Glashutte Original Senator Excellence Perpetual Calendar Bucherer “Blue Editions” will be limited to 50 pieces, available only at Bucherer stores as of June 6, 2019. It will be priced at EUR 20,000. More details at bucherer.com.Read more about the standard version of this watch in our review here.