There are several different lists of makers out there where some ”unknown” makers have been added with name, for example 133. But no 100% proof of who the maker really is.
After collecting KVK2 for several years I can say with 100% certainty that maker 133 belong to the Gablonz area. The reason is that they have the same design feature as many of the other known Gablonz makers. So hopefully this information can be used to one day find out maker 133 by name.
Most of the Gablonz makers can be divided into two design groups, we can call then Type 1 and Type 2, where the majority belong to Type 1, as maker 133.