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CD 742Ultra Rare / Museum
Threadless Cable
Unmarked · Cobalt Blue
Rarity Index
10/10
Value Guide
$1200–$5000
A museum-grade threadless cable insulator — the pinnacle of early glass.
Key Specifications
CD NumberCD 742
ManufacturerUnmarked
MaterialGlass
ColorCobalt Blue
Style / NameThreadless Cable
Thread TypeThreadless
Base TypeThreadless
CountryUnited States of America
Era1850-1865
Eagle Cap Collectibles Grading Scale
MMint — factory-perfect, no wear.
ANear/Very Near Mint — tiny pings, flea bites, up to 3 blunted drip points; factory features OK.
BVery Good — wire-groove wear, 4–10 base nibbles or blunted drips, up to 3 broken drips.
CAverage — up to 3 minor chips (<1" total), a bruise under ½", 4–10 broken drips.
DDamaged — chip/slice over 1", fractures, bruise over ½", 10+ broken drips.
RRepaired — value depends on the repair.
XAltered — irradiated or heated to change color.