A later type ABU Ambassadeur 6000 6500 Nylon Ratchet Cog. This cog locates on the end of the spool acting as a spool spacer, levelwind drive and enabling the clicker ratchet.

ABU Part No 19373.

Can also be used in place of ABU part No: 23403, the earlier Nylon Ratchet Cog fitted to many 6500 models.