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#2538 CD 136.7 PATD. OCT. 15 1872. Aqua. 
- Sold Winning Bid: $900.00
- 4 Bid(s) View Bid History
- Lot # 2538
- System ID # 600034
- End Date
- Start Date
#2538 CD 136.7 PATD. OCT. 15 1872. Aqua.
Embossed on the flat collar below the internal, three segmented threads.
This type insulator was illustrated and described in Partrick & Carter’s 1878 Catalogue, as shown in the fourth photo. Partrick & Carter, a supply house in Philadelphia, Pennsylvania, offered insulators with a smooth pinhole, segmented threads, or a regular thread. The P&C listing claims telegraph superintendents pronounced this type insulator to be the "perfection" of all glass insulators.
The consignor has shared this insulator was purchased among a collection of railroad artifacts. The previous owner stated, to the best of his ability, that it was found on a right of way operated by the Central Of New Jersey Railroad in the state of New Jersey.
Aside from a hazy surface (see second photo), the insulator remains in very near mint condition.