Is this 1675 case real?

Hello everyone! I recently bought a „original“ 1675 case from „Badingski“ on eBay. While it looks good compared to an original, it does have some differences. The most notable to me is the typeface of the serial number. The number 3 is round, when compared to other typefaces it should be hooked on top. If you take a closer look, the mid case also looks thinner somehow. Another thing I noticed is the diameter of the inner circle on the case back being clearly smaller than the original. Gladly the seller was nice enough to offer a refund if I send it back. What do you guys think?