Editing Happy Hacking Keyboard (section)

==Production numbers==
Estimated production numbers based on extensive serial number inspection are as follows (serial number inspection was undertaken via aucfree.com, an archive site for Japan's Yahoo! Auctions, which held records from June 2015 until around mid 2019, when it closed):

PD-KB300 - Professional 1 (White Printed) - 5000 units

PD-KB300NL - Professional 1 (White Blank) - 1800 units (initially PFU only planned to produce 100 of these<ref>PCWatch - [https://pc.watch.impress.co.jp/docs/2003/0424/pfu.htm]</ref>)

PD-KB300B - Professional 1 (Black Printed) - 2300 units

PD-KB300BN - Professional 1 (Black Blank) - 900 units (unique in that it does not bear the HHKB logo on the chassis' lower right corner)