Stain noticed on top-right.

So far, no known survived used letter card has been documented. Also some collector may keep this prized letter card as not many has known to exist.

The lid of the card is still originally sealed as they way it has been kept by previous owner.
 

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A letter card almost has the advantages of a postal card as far as weight and size, but also the advantage of privacy of contents is concerned. It is a double card, folded over, with gum or adhesive applied to the three open edges. It is then opened by the recipient by tearing perforations on the three sides that are on the message side of the gum. The gummed strip around the card is then discarded, giving rise to the problems collectors have in finding intact used cards.

In philately a lettercard or letter card is a postal stationery item consisting of a folded card with a prepaid imprinted stamp. The fact that it is folded over gives the writer twice as much room for the message compared with a postal card. The message is written on the inside and the card is then folded and sealed around the edges. The recipient tears off and discards the perforated selvages to open the card.
 
The Letter Card showing the official coat-of-arms of the United Kingdom of Great Britain and Northern Ireland instead of one by the Federated Malay States.