Not cinamon either because Teddy has tickings and his eyes are not red.

too bad there is no picture of rust hamsters.
the description of the ears sounds right - there is a hint of pink on both ears.
and he doesn't have black cheekflash like golden and yellow hamsters do.

-eta-
just looked for rust hamsters. they look bright red, Teddy is certainly not that.
So far he looks mostly like the yellow hamsters but without the black cheekflash and he a hint of pink of both ears.