This instructional handstamp caught my eye. It is on a Malaya air letter form sent from IPOH (cds 15 AUG 52) to Karaikudi, India (arrival cds 18 AUG 52, on reverse).
A discussion on Stampboards revealed that this instructional marking is bogus.
A similar type was reported by J. S. Cheah in The Malayan Philatelist vol. 25 no. 4 (1984, p. 45-47): Bogus Handstamps and the Faked Use of Postage Due Stamps.
He showed a handstamp "Mail Forward Through / Shipping Lines" on a 1929 registered cover. Identical to my example is the very fresh, well-inked appearance of the handstamp. And in both cases it does not make sense.
So, this one is bogus and a try to "pimp up" a standard air letter form used to India.
Acknowledgements
Thank you, Stampboards member hatter for your help.
