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Pole Top Discoveries' Event #2403 Closed February 26.
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#999 CD 145.6 "BOSTON" Three segment threads. Aqua. 
- Sold Winning Bid: $1,700.00
- 4 Bid(s) View Bid History
- Lot # 999
- System ID # 347471
- End Date
- Start Date
#999 CD 145.6 BOSTON BOTTLE WORKS PATENT APPLIED FOR Aqua. Three segmented threads.
The CD 145.6 "Boston Knob Top" is a seldom encountered item. This unusual example goes several steps beyond the typical CD 145.6, having very peculiar, three segmented threads.
Boston Bottle Works insulators with segmented threads typically have a threading configuration consisting of either three or four long "platforms" within a smooth pinhole. The platforms are raised above the wall of the pinhole cavity approximately 1/4inch. Threads are molded on those elevated platforms.
This three segmented threading configuration lacks the elevated platforms. Rather, the threads appear as shallow embossed "dashes" within the smooth pinhole cavity. The "dashes" appear somewhat like the dashes on a "dot-dash" Wade insulator, except the dashes on this Boston are less pronounced.
Quite an oddity! Was this an early, short lived attempt by Oakman for using his 1872 plunger mechanism, which was perhaps, shortly thereafter improved upon? Regardless of the reason for this oddity being produced, we will say it is quite rare!
Outer area and base remain in spectacular condition. Inner skirt has two chips, one removing "For," the other removing "Patent."