What this item is
A vintage reusable bottle stopper designed to reseal glass soda/beer bottles after opening.
Markings visible on the piece include:
“EKCO” and “U.S.A.”
“BULL DOG”
“PULL DOWN”
“PAT. NO. 48661” (as stamped on the top/side)
Name / Common identification
Often described as: EKCO USA “Bull Dog” Push-Button Bottle Stopper
Also commonly referred to by function as a pull-down soda stopper (based on the “PULL DOWN” marking).
When it was made (estimated era)
Based on the listing description you provided, it is commonly dated to roughly 1970–1989.
The visible patent number stamp suggests the design traces back to an earlier patented concept, even if the specific piece was produced later.
Who made it
EKCO (U.S.A.) — the maker name is stamped directly on the metal cap.
What it was used for
Resealing partially finished carbonated drinks (soda, beer, seltzer) to:
Help reduce carbonation loss
Help prevent spills during short-term storage
Keep the bottle covered and more secure between pours
How the mechanism works (simple explanation)
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