I worked with John for a few months while Instroke was based in Greeley, CO about 4+ years ago. The easiest way to determine if an Instroke case was made in Germany or Taiwan is the design of the base of the latch on the pocket and lid. The German-made cases have the latch base that's shaped like an eye (seen in this thread), where the Taiwanese-made has a more square oval as its base. John changed the design of the latches because they were stronger than the originals used in Germany. In addition, the Taiwanese-made Instroke has heavier duty zippers.
John implemented these changes to improve the overall usage quality of the cases as the German case's latches and zippers would fail too often for John's taste. Whatever you think of John, he was the best person I've ever worked with or knew regarding customer service. Even after the split, John continued to repair or replace cases made in Germany, without getting reimbursed for much of it, at his own expense...just because it had the Instroke name on it. John wanted everyone to be happy, even to a fault.
It's true that the German leather was, and maybe still is, better quality than the Taiwanese, but I can tell you first hand there have been some excellent quality leather cases made in Taiwan...I have one! The latch design is still a problem because the latch sticks out, so if the case is bumped putting it in & out of your locker, in the car, or abused at the pool room, they break off. It's a bummer but other than that, Instroke cases have always provided the user the best protection for their cue investment. Fix the latch thing & you have one of the best cases you can find.
Note: There are many great cases out there today that use excellent quality leather, unique designs and offer great protection (and better latch systems) - Justis, Munack & Whitten to name a few. But as far as pure function and protection, Instroke is/was hard to beat.
Just thought I'd share.
Dave