White porcelain Flat Top signal style B & O Insulator

By Michael Malanowski; posted December 29, 2025
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White porcelain Flat Top signal style B & O (Baltimore & Ohio) marked Insulator. Apparently a tougher mark to find these days… One tiny flake along the underside of the wire ridge (see image). $40 plus exact shipping. PayPal "friends & family" preferred. Happy Holidays!!!

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