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We
have both of the caps. The external thread, raised above
the lamp, usually a hoop is used to thread on the cap. The
internal thread, usual a metal lamp, the thread is recessed
and the filler goes inside, more like a plug.
Costs:
New Brass plain $2.00
New Nickel plain $3.00
New decorated; Rayo,Miller.
B&H, Flower,$5.50
Old B&H, Miller, Rayo
Other etc. $9.50
Item 956
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