Gomog has a few versions of handbooks in there. When I had my 1993 4/4 I scanned the handbook. I sent a copy to Lorne to add to the list on Gomog. If there is one on there you can download and edit to make one to imitate an original.
You can add “patina” to give an aged look. Tea is a good one to yellow the paper. Use glossy paper, add oily fingerprints etc!
