Can anyone tell me what the markings on the bottom of this shell

Popping a Sebaceous Cyst - Can I Burst a Sebaceous Cyst at Home

How to Read Crochet Symbol Charts with Video

Can anyone tell me what the markings on the bottom of this shell

Can someone help me identify this tank shell? It's about 92,5 cm

Sea Turtles Smithsonian Ocean

Mark Vinod Sinnathamby posted on LinkedIn

How to Measure a Bottom Bracket: Step-by-Step Guide

Large calibre markings (The Western Front Museum)

How Do Snails Get Their Shells?