Unusual object, an oddity (5)
I believe the answer is:
curio
I believe this is a double definition.
'unusual object' is the first definition.
(I've seen this before)
'an oddity' is the second definition.
(I know that oddity can be written as curio)
(Other definitions for curio that I've seen before include "Object of interest because it is a rare or unusual" , "Oddity, rarity" , "Rare thing sought for collection" , "odd thing" , "Small fascinating collectible object" .)