Originally Posted by
Bianchigirll
it looks to me like you have: a nice looking steel frame with a 1" (one inch) steerer tube on the fork. the silver "shim" on the steerer is for using a 1 1/8" stem on the 1" steerer. and the seller supplied a 1 1/8" cap. the seller likely supplied the shim and cap since 1 1/8" stems are more common than 1" these days
That's what I noted on my first post to the OP., as it somewhat looked like to me like a threadless adapter.
OP: Disassemble the top part of the steerer tube and tell us what you see.