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Pole Top Discoveries' Event #2403 Closed February 26.
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#3118 CD 174.5 PYREX 1919 Slight straw tint. 
- Sold Winning Bid: $13,000.00
- 25 Bid(s) View Bid History
- Lot # 3118
- System ID # 691752
- End Date
- Start Date
#3118 CD 174.5 PYREX MAY 27 1919 CORNING. Slight straw tint.
A very rare item which we have not encountered in the past! Discovered recently in Pennsylvania.
The glass used in the production of this insulator has excellent clarity and of high quality.
The 1919 date is likely in reference to a patent issued to the Corning Glass Company for a boro-silicate glass with high co-efficient of thermal endurance and high stability (resistant to chemical attack).
Hemingray Glass Company, the Fry Glass Company and Corning were all experimenting with glass formulas during the early part of the 20th century, attempting to create glass which would successfully withstand thermal shock. Corning's creation was "Pyrex" glass, which was widely used in the baking industry, and also used in the production of electrical insulators.
The embossing is quite weak with traces visible and some non-existant. No flakes, chips or dings! Has some scattered, faint marks (similar to very slight sandblasting) on only a portion of the skirt... quite minor and not at all noticeable or detracting (easily overlooked unless brought to your attention).
Pole Top has sold a large volume of scarce and rare insulators over the past few decades. Considering we've never sold an example, or even recall seeing one, this certainly is an elusive item!
Update: Second image added for size reference. The Pyrex insulator measures 3-7/8 inches across the base.