Hallo
My favorite manufacture. Gebrüder Heller Marienthal ;)
I have a family from S code from 1934-37 and from the manufacturer's name from 1937-40. All are matching number and have a nice unsharpened bluish blade but I miss it from S code S 178 1936, otherwise everyone is from one family Gebrüder Heller Marienthal.
I also have some from WW1 with the same manufacturer, it is both with and without sawback. I have other manufacturers in my SG 84/98 III bayonet collection, I have bym Genossenschaft Maschinenhaus, Ferlach-Kärnten, Österreich/Austria and other manufacturers in my collection :)
jtns63