Glass Insulator Identification, Dating & Value Guide
A 27-page PDF covering glass insulator profiles, marks, condition and evidence-based comparison research.
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What you receive
Identify the clues. Research the date. Compare the evidence. The Glass Insulator Identification, Dating & Value Guide is an independent 27-page PDF for collectors, antique dealers and vintage resellers. It covers North American glass pintypes with practical context for other forms. WHAT'S INSIDE • 23 chapters covering CD profiles, pinholes, inscriptions, base types and condition • Hemingray mold and date-code layouts, patent-date cautions and Brookfield / Millville maker context • Color, purple-glass, carnival-coating, reproduction and commemorative cautions • Eight named auction observations with direct source links, condition context and the auction's stated 10% buyer-premium basis • A method for comparing completed sales; the archive sale date is not established and no universal value ranges are claimed • Cleaning, care, provenance, research and selling guidance • 23 chapter bookmarks and clickable contents entries YOU RECEIVE One printable US Letter PDF: MercantileDesk-Glass-Insulator-Guide-v2026-10-06-b1.pdf. 2026 Edition, revision b1 dated 6 October 2026. This is a digital download; no physical insulator is included. Read on a computer, tablet or phone using PDF zoom. Dates and attributions can remain uncertain. The linked sale records teach a comparison method; this guide is not authentication, an appraisal or a guarantee of value. A scarce, disputed or expensive variant needs specialist research. Personal and in-business use for your own inventory and staff training is permitted. Do not redistribute the PDF. Independent LintHead Restorations publication; no manufacturer, association or auctioneer endorsement is implied. You will get a PDF *(201KB)* file
Source checked 2026-10-15. Full details on Payhip ↗
