What's this? Worth buying? ALPINE ASG-301 100kHz-170MHz AM/FM Signal Generator

[Eifel]

Hello!

I am looking for AM/FM signal generator for AM/FM radio repairs (or attempts to repair ). Saw this on ebay:

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eBay auction: #https://www.ebay.com/itm/124347200042?ViewItem=&item=124347200042

Looks very nice, but I couldn't find any information on it by googling alpine and model name: ASG-301.
Also what possibly may mean this "AM noise limit sensitivity high"? Untested and sold as-is. Worth buying?
Seller also have listed untested "Panasonic VP8193A" that one looks kinda popular..

[coromonadalix]

This link is better : https://www.ebay.com/itm/124347200042?

It open without problems


Alpine had its name applied on some brands, can't recall witch,  if the price stay low, it seems a good opportunity to buy it,  but the problem written on the top case ?  not sure if it can be a nag