Mid to late 90's. I emailed Eureka as they bought out camp trails, however there reply was "it was to old of a model to gather any info on sorry for the inconvenience." I have attached a picture for reference. The pack may very well be a much older model I only know when I bought it new from the store was in 1997. Not a million dollar pack but it is what I have and works great. Trying to avoid finding another that fits as well and functions for me and save a dollar or two in the process. Really appreciate you guys looking at this.