Perish the thought mate - that's just not right? - ask me nicely and I will send you another tuck. Ha ha. My best information is that they were made no later than 1972/3 in the UK. I couldn't find that much on them using a well known search engine. I received an unopened nos retail pillar pack of 100 from my neighbour Mr A. He used to run a grocer shop and these were left over when he sold up in the early eighties. They had been in storage for years but when it came up in conversation one day that I 'proper' shaved - as does he - they were passed on. Nice. With this vintage blade - it is interesting what you say about its suitability in the Fatboy for you - it works best for me in the Slim. Old school razors and old school blades - sort of makes sense? Cheers - I.