Swanseaboy

Any ideas on the age/ period of this netsuke? Any is it Ivory or bone Dimensions Width3.2 cm Depth 2.3 cm Height 3.3 cm Is it Meiji period(1868-1912)? Also, I've researched and thought it was ivory as I found concentric lines meaning sperm whale tooth or hippopotamus (see photos) but then I also see what look like blood vessels black marks (Haversian) and they have the concentric lamellae. Any idea of value. Any input much appreciated.