Nexus VM-5 Modulator

[MIPS]

Found this junk shopping. Locally made with F-type connections for composite and line level mono in and is apparently factory set to "Channel D"




There's sharpie on the side somehow relating D to the number 17, which according to this -

When ordering please specify what Channel(s) you would like. We will check availability and advise by email.

AVAILABLE CHANNELS:

VM5: 1 7 8 9 10 11 13 16 17 18 19 21 23 24 25 29 34 36

Requires a 12 VDC power adapter - NOT included.
https://www.torontosurplus.com/a-v-p...scription.html

...implies this is a UHF RF modulator, but I can't find any more information on it. Is this a rebrand UHF modulator or something less interesting?