This is one of five articles on Letraset products which are not Action Transfers, but which should be of interest nevertheless.
You can get from each article to any of the others by following these links; they are all worth a look.
This US ad from 1964 shows off not only 'Instant Lettering', but also 'Special Sheets' & 'Titles for Electronic Equipment'.
The early US Letraset catalogue/brochure above covers it in detail, & also mentions the 'Meter & Dial Marking Kit' which I would love to show you if only we had one! Anyway, the 'Terminal & Chassis Marking Kit' & 'Titles for Electronic Equipment' came in a variety of little boxes, each containing twenty-four sheets.
A quick note about serial numbers. 'K' serials indicate transfers printed on a Kippax silkscreen press. All the early Instant Pictures (Busy Bees & monochrome Panoramas) were printed on this press, but the earliest serial seen so far has been K25 (presumably from late 1964 or early 1965). Now you can see how those numbers got to be so high a starting point; below the sheets are K17, above K10.
The notes for these sheets are the most thorough transfer instructions I have ever read. They're fascinating, but to avoid duplication, I've put them on the page dealing with Letraset application instructions:
Picture Credit: The SPLAT Scan Archives
© Tom Vinelott 2017