Dating postcards stamps
Prior to this date - pre-printed plain cards were in use which are commonly referred to as 'Postal Stationery' The size of cards varied throughout this period. The 'Intermediate' size of 5 x 3 inches (approx) was followed by the adopted standard sized card 5½ x 3½ inches which was in common use from 1900 until the 1960's The postage rate for postcards was a halfpenny - ½d ½d 1894 - 1900 Vermillion The colour of the halfpenny - ½d stamp was changed in 1900 to meet international standards.
½d 1900 - 1901 Blue-Green Quenn Victoria died on 22 January 1901 Great Britain was the first country to sanction the use of the divided back postcard in 1902. The divided back allowed for one side of the card to be used for both the address and a message seperated by a central line.
The other side could be a complete picture (or photograph) Prior to this (undivided back) cards were in use which allowed for address only on one side and a brief greeting on the picture side.
It is of course possible to find undivided back cards used after 1902 and divided back cards used with older (pre 1902) stamps Stamps for King Edwards reign were issued on 1st January 1902.
The non-urgent postcards follow the rate for non-urgent letters  1971, 4 January: 50 c (urgent), 30 c (non-urgent) 1974, 16 September: 80 c (urgent), 60 c (non-urgent) 1976, 2 August: 1F (urgent), 80 c (non-urgent) 1978, 15 May: 1.20 F (urgent), 1 F (non-urgent) 1979, 15 October: 1.30 F (urgent), 1.10 F (non-urgent) 1980, 1 August: 1.40 F (urgent), 1.20 F (non-urgent) 1981, 1 September: 1.60 F (urgent), 1.40 F (non-urgent) 1982, 1 June: 1.80 F (urgent), 1.60 F (non-urgent) 1983, 1 June: 2 F (urgent), 1.60 F (non-urgent) 1984, 1 July: 2.10 F (urgent), 1.70 F (non-urgent) 1985, 1 August: 2.20 F (urgent), 1.80 F (non-urgent) 1986, 1 August: 2.20 F (urgent), 1.90 F (non-urgent) 1987, 1 August: 2.20 F (urgent), 2 F (non-urgent) 1993, 5 July: 2.80 F (urgent), 2.40 F (simple) 1996, 18 March: 3 F (urgent), 2.70 F (economic) • On 1 January : France’s currency changed to euro (symbol: €). 2003, 1 June: 0.50 € (urgent),0.45 € (economic) 2005, 1 March: 0.48 € (economic, the same tariff as second-class letters - , and were usually printed advertising cards. During the first half of the twentieth century, packs of six, ten, twelve or even twenty and more cards were issued in two different formats.As people caught on to the usefulness of this cheap and fast method of sending messages, the poor man’s telegram - remember the telephone did not yet exist - national postal services authorised the sending of postcards through their postal systems.It must be remembered that many years, even decades may pass between the taking of a photograph, when it was published on a postcard, and when the postcard was posted.We have vintage save the date postcards and were told to use postcard stamps.I went to the post office and all they have are Hawaiian shirt stamps that say Aloha for postcards. Would it be tacky to just use a regular forever flag stamp? The whole idea of the postcard was to save money and I don’t want to spend a fortune on “special” stamps.