Here's a pair of rare Electro Voice PL9 omnidirectional dynamic microphones. They’re the “pro” version of the DO54 (which means they're a darker color). If you're not familiar with these, they are widely considered to be among the flattest, most natural-sounding dynamic mics ever made, nearly identical to the beloved RE55. They're no longer in production, and it's rare to find even one, much less a pair.
The manufacturer lists the frequency response as 50Hz to 18kHz, extraordinary specs for a dynamic!
They are my favorites to use as room mics, as they don't give you that "spitty" top end that so many condensers emphasize. (Put them in front of a drum set and squash them - they take compression beautifully!) They're great on acoustic guitar - you can move them in close, because they don't have the proximity-effect low end cardioid bloom that makes the instrument sound muddy. Basically, wherever you want natural reproduction of the sound you're recording, they are a fine choice.