Re: Rubber sleeve idents / markers - printing numbers/letters
Our company, back in the days when they were defence subcontractors, also used printed Helsyn sleeves. I have a biscuit tin of them containing packs in various states of preparedness, that also contains some paperwork. I've no idea whether it will give any clues as to how the sleeves were printed, but I can't ask the man who gave me the box as he's no longer alive, and I fear the same is true of anyone from the generation involved in those projects. I will keep an eye out for the tin.
I agree that printing and fitting sleeves that are already 40 years old might not work. Pink Helsyns are still available, not sure whether the full historical range of sizes, in unlubricated versions which I expect would be necessary for printing. I remember the day I discovered pre-lubricated ones though!
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