WW 2 era Forces Air Letters - two queries

[Neil Williams]

Folks

having recently acquired a copy of ORJ Lee's 'British Forces Air Mail Letter Cards & Air Letters' (1988), and having worked through my Aden material - I have two questions: - see scans below

1. A type J sub-type 6 from December 1944. This shows a vertical doubling of at least 1mm. Is this noteworthy, or just a curiosity?

2. What I assume to be an Indian Forces AL, IAFF - 1083, posted at Aden in December 1947. No other marks, reference numbers etc. The AL obviously travelled to Aden with the writer. Indian forms aren't in the aforementioned publication, so I'd be grateful for suggestions/tips on its classification.

Many thanks.
Neil W