Vintage Naef Wooden Stacking Bocks - Set of Seventeen feathered brush perhaps the result of past

perhaps the result of past use

threaded with elastic inside

On the bottom he has written his name in pencil -- which appears

but just found this one

Vintage Naef Wooden Stacking Bocks - Set of Seventeen feathered brush perhaps the result of pastThese were a happy find the other day at a favorite shop in New Hampshire I've had a couple of rare sets of colored blocks of the same form designed by renowned Swiss carpenter and designer Kurt Naef (19262006) in 1954, but had never seen a set of unpainted wooden ones, though I have since learned that they were produced. No box with these and they are unmarked, but it's quite clear that is what they are, and all signs point to this being a. mid