This is a small table radio from 1951. Philcoradio.com shows it in both mahogany (mine) and ivory—they're both plastic. Same website says it's just the previous year's model 50-520 with a new label.

It's also the runt of the bunch, the smallest, most conservatively styled. Philco made a bunch of different cabinets in a number of styles to appeal to various tastes. If you look at the service docs, it lists seven different types of cabinet: all are molded plastic, but there are three versions of mottled mahogony (one of them is mine), three versions of ivory, and an ebony.

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7A8 - converter
12BA6 - IF
14B6 - 2nd detector/AVC
50L6 - Audio out
35Z5 - Rectifier

Current status: on the shelf; needs electro-mechanical evaluation.