Silver Mug & Brush Tray

[HungeJ0e]

I purchased this silver plated set on good 'ol E-Bay after the seller knocked off a few dollars...

At first I assumed it was a two piece scuttle, but now that I look at it, it looks like the bottom is intended to build lather.

The tray has an inset, so it sets in to the mug. I'm eager to get it in person, to see what's actually going on here, and will post more photos once I've got my grubby fingers on it.

Does anyone have any background on the intended use for the separate tray?

Cheers, - HJ