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Just another question: are there perforated briquets??
Hi Klaus,
there certainly are, curiously, Australia the hot country,
we get really chilly nights / winters
and Wood burning stoves are very popular.
Briquettes come in a vast array of designs, albeit, perforated would not be common or desired here, the more dense the block, the longer it lasts in the wood stove.
One here, can also buy your own personal briquette maker, fro old newspapers.
I have worked out, I save about 50% of my power bill by using an inverter air conditioner (c $2000) against burning wood in a stove (c$5000)
Which is a saving for the climate as well.
(also no dust for the stamp collection)
Certainly keep your piece, it is fascinating piece of Ephemera.
Try not to discard any pieces like this, there is always someone
who would collect them. (It is not worthless, the worth lies in its existence and interest to history scholars)
Postage stamps at that period would have been a fascinating to the public, hence the use in advertising.
From my searches, it may be the only one in the world surviving,
consider that 