Sappli. is a stationary store located in Fukuoka prefecture. They have been releasing an astronomy themed pen each summer since 2016. See below for a list of LE Sailor fountain pens Sappli had released/announced as of August 14th, 2018.
Kokura Sanen – Sun
Price: ¥ 32,400 (including tax)
Release date: Saturday, August 18th, 2018
Limited number: 50 pcs
Nib type: 21k gold, large size
Nib finish: two-tone
Nib size: EF, F, MF, M, B
Metal parts: Gold plated finish, original engraved on band “SINCE 2012 SAPPLI.”
Body size: φ18 x 129 mm (including the clip)
Body weight: 21.6 g
Can be used with a cartridge or a converter. Comes with two black ink cartridges, manual, warranty.