There is one (at least) offered on ebay at present. Link below. It has what appears to be a catalogue number of L33 after it. Not sure which catalogue. I couldn't find it in Gibbons. It is not much but hope this helps.
Nice information about the cancels. Also nice to know where the unused examples likely come from. I have seen a note that the bicolors (value tablets in a contrasting color) are 1895, but that should be verified before being tucked away as correct.
I suppose with modern refrigeration one can forget the older importance of salt, Used for prservation of foodstuffs and as a cleansing agent and from prehistory a method of payment.
The phrase "worth one's salt" began with the ancient Romans. One reference suggested that the origin of the phrase "worth one's salt" could date back to before 900 B.C. During that time, Roman soldiers were paid for work in salarium, which was an allowance for the purchase of salt. Salt was considered good for human health and was a hard to find commodity. The word soldier, in that era, literally meant 'one who is paid in salt. The 'sal' in the word salarium is Latin for pay. Over the years, the word salarium was shortened and came into the English language as salary. To say that someone is worth his or her salt, you are saying that he or she is worth the wages that he or she earns. One particular reference used a quote from a Human Resources manager who told her supervisor that she had not hired a new administrative assistant because she had not interviewed anyone worth their salt.
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