The pieces are well-proportioned and consistent with other specimens of German glass-eyed knight sets.
From the Chess Museum website http://www.chess-museum.com/staunton-style.html
Dorland.com posts a similar, though smaller set, writing that they originate from the twenties and thirties. My seller told me he had taken it to a dealer of German antiques in Madrid who estimated it originated between the thirties and fifties. The box my set came with is virtually identical to that show on the Dorland site in form, patina, and wear. http://dorland-chess.com/179-german-glass-eye.html
I've been wanting to post about this glass-eyed knight German set for some time. I acquired it a couple months ago from a wonderful online shop physically located in Madrid, Ajedrezcalde, operated by Jon Enriquez.
https://www.etsy.com/shop/ajedrezalcalde?ref=pr_faveshops
The set has become one of my favorites, and it came with a truly beautiful board as well. The Kings are a shade over 95mm and the set is moderately weighted.