Bellstaf stopped making the bags you are referencing. Has to do with a high end makeover that started when the brand was sold. I think they also got rid of the line because of the rampant counterfeiting.

Filson bags are nice, but IMHO don't have the same look and feel of the old Belstaff 554 and 556. (On the other hand they are almost certainly better made and more durable.) Gurkha used to make a nice competing bag but when they rebranded themselves as made in USA, the also killed the lower price line in favor of $1,000 plus leather bags.

There is a large community out there looking for bags like this but not a lot of manufacturers stepping in with name recognition like Belstaff.