Skorpion S-1 EJAB Crown & Anchor Mark Hollow Handle Survival Knife

Found this at a flea market this weekend. It seems to be a rare knife. I didn't find much info from a google search. There is a record online of a Skorpion s-1 being sold online, but that was from a limited edition that were made in the 1980's.

There are different manufacturer markings on mine compared to the pictures of the knife from the 1980's (i.e., the EJAB Crown & Anchor Mark, the numbering looks different) which makes me think this might be an older or original version of the knife. But I could not find any mention online of an older version. Skorpion has been making knives since 1864 so it could be pretty old....

Please share if you have any information on this knife. I think it's strange that I can't find a reference to any others online. Thank you.