4 Vintage WMF Henckels Silverplate 9-3/4” Knives Twin Mark

The "Twin" mark ("Zwilling" in German) found on the blades of WMF knives indicating the blade was manufactured by J.A. Henckels of Solingen, Germany

These knives, along with any other WMF flatware I have on my site were acquired through my husband’s family who lived in Germany and migrated to the USA.
These date back to the early 1900’s I believe
The blades have the WMF and Henckels (Twin/Swilling) mark on them.
3 of them are marked 90 and the 4 the one is marked with a 21. See Pictures.

The knives are approx. 9-3/4” long with the blade being approx. 5-1/2” long and the handle being approx. 4-1/4” long.
Each knife weighs 2.9 ounces
They are in pretty good condition, considering the age.  Again, see pictures.  Sold “As Is”.