I think this is the 2370 1/2 creamer shown here which I assume is the smaller version of 2370. It has a nice clear Peacock mark. To the naked eye the colour is quite a lot darker than the photos show.
http://www.victorianpressedglass.com/pdf/sowerby/sowerby_1912.pdfThis is the earliest catalogue I can find it in, but it might be a bit earlier.