Reading further through the listings with my mind a little clearer this morning it would seem that
the numbering system took effect in November 1912 and the naval wing had 16 aircraft that were
re-numbered and the others in the sequence were taken up in numerical/chronological sequence as
aircraft were ordered although deliveries were not necessarily in the same sequence. The 1-200
numbers were taken up in full by midsummer 1914.

This would tend to imply that number 129 would be from 1913 or early 1914.

--
Andrew B (Cheshire, England)

"Heavier-than-air flying machines are impossible."
(Lord Kelvin, president Royal Society, 1895.)