Henckels pen knife

[OLDE CUTLER]

I had picked this up a while back out of a dollar bin at the flea market. It is a 3 inch Henckels serpentine sleeveboard pen and when I got it, it had a broken spring. I had another slightly larger pen that had bad blades, so transplanting the spring worked perfectly. The handle material is in great shape, so I retained it. Just wondering though, did Henckels use celluloid on these?

[doglegg]

Great work OC.