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Pole Top Discoveries' Event #2403 Closed February 26.
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#2070 728.4 W. BROOKFIELD JULY 25 1865. Aqua with impurity. 
- Sold Winning Bid: $1,050.00
- 17 Bid(s) View Bid History
- Lot # 2070
- System ID # 510671
- End Date
- Start Date
#2070 728.4 W. BROOKFIELD 1 55 FULTON ST. N.Y. CAUVET'S PAT JULY 25 1865. Aqua with opaque impurity.
These have been found at various locations, including Texas and New Mexico, where they were used on government built lines.
Certainly an oddity being threadless, as the embossed 1865 date was for Louis Cauvet's patented feature for a threaded pinhole and corresponding threaded pin. It took several years for some telegraph companies to convert to using threaded insulators, so Brookfield likely produced both threadless and threaded versions of this insulator for a period of time.
Dome embossing on both mold halves. Most of the embossing is medium strength.
Attractive, milky-opaque impurity meanders from the top of the pinhole, all the way to the base.
Small, shallow flakes can be seen on the base edge in the second photo. Base bruise is visible in the first and second photos.