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Pole Top Discoveries' Event #2403 Closed February 26.
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#240 EC&M Co. Vivid cobalt blue. 
- Sold Winning Bid: $2,400.00
- 5 Bid(s) View Bid History
- Lot # 240
- System ID # 217008
- End Date
- Start Date
#240 CD 123 EC&M CO. S.F. Vivid cobalt blue. "F" mold with 4-5/16" height.
This flared skirt mould variant with rounded dome has been designated as mold type “F.” Both the flared skirt variants "A" and "F" were placed in service during the early years of EC&M production. The Electrical Construction & Maintenance Company was formed in late 1870, and production of the embossed “F” mold EC&M’s likely commenced shortly thereafter. Cobalt blue examples were used in several different locations, most surfacing in California and Nevada.
Perhaps one or more glass houses producing blue soda bottles in the 1870's in the San Francisco Bay area might have used the same glass batches to manufacture insulators. These rich blue beauties can be found in varying color densities, this one having an intense characteristic, creating a purple tinge to the glass.
A small area on the reverse dome corner, the size of two match heads, has an appearance of a pot stone halo. Quite inconspicuous and likely present from the day it was manufactured. Typical "arrowhead" flaking along the base, shallow chipping and shallow surface bruise on base.
Normally we do not provide estimates for "Diversity" auction listings. However, it is difficult for a bidder to determine value of this particular item without actually seeing the insulator base "in person," so we will give an approximate estimate of $2800 to $3000.
From the collection of the late John Ayer.
Update..... 10:25 A.M. Thursday, April 30. Third photo showing the base was added.