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Pole Top Discoveries' Event #2403 Closed February 26.
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#2419 731 W. BROOKFIELD 55 FULTON ST. Aqua. 
- Sold Winning Bid: $900.00
- 18 Bid(s) View Bid History
- Lot # 2419
- System ID # 580966
- End Date
- Start Date
#2419 731 W. BROOKFIELD 55 FULTON ST. N.Y. CAUVET'S PAT JULY 25 1865. 6. Aqua.
Front dome is embossed with the patent date in large lettering. Front skirt is marked with small Brookfield lettering. Numeral "6" on reverse skirt. Dome embossing is mostly readable. Skirt embossing is weakened with some lettering not readable (typical of this type insulator).
The threadless 731 style was a popular insulator design with telegraph companies starting in the mid 1860's, and that popularity continued into the early 1870's. After the threaded pin concept was patented by Louis Cauvet in July 1865, production of that type insulator began. The usage transition of threadless to threaded insulators by communication companies took several years.
The CD 131 was among the earliest threaded insulator types produced by Brookfield, and they were manufactured for a number of years. During the "threadless to threaded" transition period, molds engraved with the 1865 Cauvet patent date were also briefly used to produce threadless insulators. It is quite unusual for a threaded patent date to appear on a threadless insulator!
The embossed Brookfield 731 is more difficult to locate than the 728.4 with Brookfield-1865 marking.
Excess glass at the base corner was removed, leaving small flakes (see photos). "Fisheye" type, surface bruise on the reverse wire ridge (see second photo). Otherwise, only a couple shallow base flakes.