Deep dive look at the Pilot Custom 823 vacuum filling fountain pen in smoked black with a medium 14k gold nib. Includes comparisons with the Pilot Custom 743 and Wing Sung 699, a disassembly and tips to get a full fill. Pilot Custom 823- https://amzn.to/452D7QV Pilot Custom 743- https://amzn.to/3PpNatG Wing Sung 699- https://amzn.to/453FSBz Iroshizuku Yama Budo- https://amzn.to/3Pw3wRA 00:00 Design Overview 03:21 Size Comparisons 03:34 Compared with Pilot Custom 743 and Wing Sung 699 05:43 Disassembly 08:01 Reassembly 09:32 Inking 10:12 Getting A Full Fill 11:20 Writing Sample 13:34 Closing Thoughts