^^^^^^ +1; So the fork is a Tange brand, Strut model. Looks like the elastomer kit is still available -
https://www.suspensionforkparts.net/eshop/tange/tange-strut-s/gs-elastomer-refresh-kit.html?review=write&product_id=94 .
Manual -
http://suspensionforkparts.net/manua...Tange_S_GS.pdf
Only 40 mm of travel - so is it worth the expense/work, vs. a rigid?
Hey - you're over 10 posts. And your find has definite cool/oddball factor. You are hereby required to post pics.