Here are pictures of some interesting glass envelope crystals I received today in the mail. I'm not sure if I should call them "vintage"; they aren't that old based on the date stamps. Very interesting nonetheless. I hope to use them in a project in the future.
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5 MHz Glass Envelope Crystal
Better view of the mount in the 5 MHz crystal
Bottom view of the 5 MHz crystal
25 MHz glass envelope crystal
Back side of the 25 MHz crystal
Bonus: 10 MHz PK-171 crystals
- Dan W.