On Fri, 18 May 2012 09:21:09 +0100, Andrew B wrote
(in article ) :

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.

My thanks to both you and Savageduck for confirming and extending what I
suspected.

Also, for purposes of clarification and correction, the aircraft was designed
by a Mr Wright, built by a Mr White but named Wight after the island where it
was built.

I assume this was because the names Wright and White were already established
in the world of early aviation.