This is a real fossilized finger & claw of a Romanian cave lion (Panthera spelaea)!
Cave lions went extinct ~13,000 years ago and these particular specimens were found in a Romanian cave. They have been depicted in ancient paintings, ivory carvings and clay sculptures - perhaps most famously in the ~30,000 year old Chauver Cave in France.
Measuring ~5.5" long, this would make an incredible and rare addition to any collection.
**Please note: while these are authentic cave lion bones, they may be a composite of multiple cave lions. Bones would often be disturbed and moved around over the last tens of thousands of years.**