For sale to organize my collection. National (Matsushita Electric) STM-58 Stereo MM Cartridge & Tonearm Integrated Pickup A stereo MM cartridge released by National in 1959. Although the source is unknown, there is information on the internet that it was the first domestically produced stereo MM cartridge. In any case, it is a very rare and valuable cartridge from the time when stereo was just beginning to spread, and even high-end stereo sets and parts for enthusiasts from manufacturers mainly used crystal cartridges. I removed it from a National idler drive player, but I haven't had many opportunities to use it, so I've decided to sell it. I checked the operation by playing a record before removing it from the player. I confirmed the audio output from both channels. I didn't feel any distortion or volume difference. I will also include a replacement needle (sapphire) that I obtained on a net auction and the needle (diamond) that was attached when I obtained it. Condition: Operation confirmed Although it is set as junk (overall poor condition), it doesn't have much dirt or scratches for its age. As described above, please consider that it is a used item and purchase it as junk.