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The NAMC’s “Catalog of all Series Matchbox Models” (first edition) has a version with labels and a blue roof light listed as variation 55-3c. Given that the decal/blue roof light version is missing from their list, I would suggest that this is a misidentification. If other examples are found, the model become Nick's code 5.
The AIM “1-75 Series Regular Wheels” catalogue (second printing, 1983), Stannard and Houghton do not list any variations not already covered by Nick.
U.K. Matchbox did not cover the model.

You are correct Idris! The second NAMC catalog printing has the variation corrected with blue roof light and DECALS, not labels as in your first printing of it. There are not any new variations in it, only the same 4 known by us today. kwakers

Thank you for laying that one to rest, Dick.