Launched in July 2017, this is a very different product to the Martini Bitter of the 1990s. The more complex and grander named Martini Riserva Speciale...
Long answer: This is based on rectified grain spirit (effectively very high proof vodka) and does not degrade rapidly. Wine-based products (e.g vermouth, Lillet, Dubonnet) require refrigeration, and even then may have very limited shelf lives.
Worth a try when I purchase my next lot. Currently I am using Venezia Select which I find much nicer than the standard Campari. I see the Select brand is not featured here on your site.
If you search "Select Aperitivo" in our site search at the top of the page, you'll find our listing. I classify Select in our red aperitivo category alongside the likes of Aperol.