Whilst the pre-war rates were interesting, and foreign usage especially ripe for various combinations of adhesives depending on weight and insured value, one of the best periods is the 1970s, as I am of the opinion - until proved otherwise - that many of the envelopes used in that period of rapid inflation in postal rates, were never used at post offices without the addition of adhesives because the rate had increased before they could use them.
And in some cases, uprated stock was further uprated, especially in 1975 when the postage rates increased twice. But that's for later.
Tonight I'm showing an ordinary registered stationery envelope sent by a reader (RW). It's a basic 23p envelope, officially uprated by ½p when the letter rate increased. First issued in 1971 the 23p covered the 20p registration fee and 3p 1st class letter rate. On 10 September 1973 the letter rate increased to 3½p hence the addition. That rate lasted until June 1974.
The letter was posted from Yeovil to a holiday camp in Paignton, presumably containing a deposit in banknotes for a holiday booking - not everybody had a bank account, and cash payments were common 50 years ago.
The Goldcroft sub-postoffice used registration labels captioned Yeovil, with the branch identification the numeral 5*. But apparently Goldcroft's supply of labels had been exhausted and not replenished (hard to believe), or lost! So the postmaster improvised in manuscript, and recorded the letter in the ledger as usual.
* More about this on the Somerset Postal History Blog.
We don't know how long this situation at Goldcroft lasted, nor how many registered letters were sent. But what we do have is a rescued cover with a story behind it. Whilst manuscript registration 'labels' are relatively common in many African countries and some islands in the West Indies, this is the first I have seen in the UK.