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Talmadge C 'TC' Carr
 

Sergent does not make an "O" scale coupler.  They do however make an "S" scale coupler.  The "S" coupler is 3/4 size "O" which is same as "On3".   Kadee does the same thing.  Their "On3' & "S" couplers are identical excepting the trip pin.

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