I can hardly believe the Sapporo is meant as a replacement for the established 1911 fanily.
I rather think this is a separate family along the Professional Gear design, which started mid 2005. The Sapporo and Sapporo Short are the slimer sisters of the Pro Gear and Pro Gear Short.
For some markets, the Pro Gear flat top family is simply more suitable, as e.g. here in Germany there is no real market for Montblanc copies (including myself as a Pro Gear owner). Actually Rolf Thiel from missing-pen.de is still the only importer here. Also in other narkets, there are people who don't want a MB lookalike but want Sailor quality.
The UK sellers were the first to introduce them to the European markets, it may be even before the NA sellers.