watches of switzerland group plc said wednesday that performance for the first half of fiscal 2023 has been robust driven by broad based sales growth and raised its fullyear guidance the retailer said it has upgraded its fiscal 2023 revenue range from 150 billion pounds to 155 billion pounds 173 billion and 179 billion to reflect foreign exchange movements this compares with a previous guidance range of gbp145 billion and gbp150 billion however guidance for adjusted earnings before interest taxes depreciation and amortizationwhich strips out exceptional and other oneoff itemsremains unchanged in the range of flat to 005 it added the company added that revenue for the first half ended oct 30 rose to gbp765 million from gbp586 million driven by luxury watches revenue increase of 31 to gbp667 million the company said that the increase was boosted by us market robust momentum representing a revenue of gbp311 million and increase of 60 at constant currency the first half of the year has been a busy period of new showroom openings  including five showrooms at the iconic battersea power station in london and additional monobrand boutiques across the uk us and now europe  together with showroom refurbishments as we continue to invest to elevate the luxury experience for our clients chief executive brian duffy said