For show a very nice frosted and clear pressed glass butter dish (or butter cooler?) which I think is most likely Molineaux & Webb, although looking on The History of Molineaux & Webb website it states that the knop is similar to Percival Vickers' Osborne Set butter cooler. I can't find my particular design on there.
The dish and lid have the following lozenge just in case the image is not clear - reading clockwise: W, 18, 4, R. which dates its registration if I'm correct to 1865.