E-stay frame, know nothing about them, maybe Frank @incorrigible could shed some light.
1990's Pacific Cycles Mountain Expert II 2 Frame and Fork Splatter paint e-stay | eBay
Blue and white splatter paint with a cool pearl in the lacquer. 18 3/4" centre to top. 17 1/4" centre to centre. Good used condition. There are a few marks related to age and use.
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