Found it in the Kitchen #7

That's it only seven per series, and this one is now complete.
The series and the items are:

#7 This one, a Marmalade Slicer
#6 A push along garlic chopper
#5 a glass jampot and spoon
#4 Part of an antique ice cream maker
#3 A flour seive
#2 Part of a lemon squeezer
#1 A 1950's cream maker