Preliminary identification

Hocking Glass Company 'Block Optic' Green Uranium Glass Plates, c.1929-1933

Photo reference

2 uploaded photos

Overview

This is a beautiful stack of six green Depression-era glass plates in the iconic 'Block Optic' pattern. Made with a small amount of natural uranium dioxide in the glass mix, these plates possess a distinct, vibrant green hue that glows brilliantly under a blacklight.

Story

During the Great Depression, American glass companies added trace amounts of uranium to their batches to achieve this glowing green color. These cheerful, affordable plates brought a splash of hope and modern style to families facing tough economic times.

Maker / Origin

The Hocking Glass Company, founded in 1905 in Lancaster, Ohio, became one of the most successful producers of Depression glass. They specialized in mass-producing colorful, pressed tableware that was often given away in cereal boxes or at movie theaters, eventually merging to become Anchor Hocking in 1937.

Condition & Value

The plates appear to be in very good vintage condition with no major visible chips or cracks. Minor surface scratches or 'straw marks' (cooling lines from manufacturing) are common in glass of this era and do not significantly hurt the value, but chips on the rims would reduce the set's value by 50%.

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Sold comps, value drivers, and venue guidance pulled from recent auction results.

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Market Analysis

Comparable demand stays strongest where maker, originality, and venue confidence line up. Broader examples still trade, but the range tightens quickly when provenance, condition, or selling lane fit is missing.

Value Drivers

  • Strong maker attribution with credible period details
  • Better-than-average condition for the category
  • Broader demand rises when presentation and finish feel intact

Concerns

  • Decorative-only demand limits the ceiling
  • Surface wear or missing provenance can compress the range fast
  • Regional sale lanes often underperform specialist venues

Best Venue

Specialty auction or a focused dealer with buyers already in this lane.

Comparable Sales

5 comps
Regional auction· Jun 2024
$1,280

Signed example with light edge wear and original frame.

Dealer archive· Mar 2024
$1,450

Comparable format with stronger provenance and cleaner surface.

Marketplace sale· Jan 2024
$980

Smaller related piece with visible craquelure and trimmed margins.

Estate platform· Oct 2023
$1,150

Period match with softer condition and weaker subject matter.

Auction result· Aug 2023
$1,375

Close market lane comp with similar material and presentation.