Thank you for viewing. I have decided to part with this item, which I have kept in storage without using. I stored it with a desiccant in a hard case for storage, along with other microphones. This isn't the Porsche logo, but it's a vintage model made in the USA, and this logo is actually becoming rarer. I have confirmed that it produces sound without any problems. There is no noise. The internal urethane had severely deteriorated, so I have reshaped and installed new urethane. I believe the urethane here is more for protecting the diaphragm from moisture, rather than being directly related to the sound. It comes with a new SHURE genuine grill ball and windscreen. The original grill ball is also included. The magnet used is different from the current models. It uses an Alnico magnet, which is also commonly found in guitar pickups and the audio world. In comparison, the ferrite magnet used in the current SM58 is cheaper and has weaker magnetic force. My impressions of the sound quality are purely personal opinions and feelings, so please take them as a reference. Compared to the current model, I felt that the vintage model had a clearer sound and more sound pressure in the 400Hz to 1.6kHz range. When I listen to the current model after listening to the vintage model, it feels a bit scooped in the sound. However, it's not that one is inferior to the other; they have the same character, and it's just that there is a difference between the microphones. I thought that if you like the character of the SM58 but want a little more presence in your vocal range, the vintage SM58 would be a good choice.