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Simpson's General Aviation has different build number to that qouted in article:

• WA-40 52 built (article has 2+50) which agrees
• WA-40A 57 built, article has 40 and 40A total as 180 = 128 40As
• WA-41 58 built, article has 60 built.
• WA-4/21 30 built, article has 25 built.

Total 197 v total 265, anybody have another source ? MilborneOne ( talk) 15:02, 27 December 2008 (UTC) reply

Just to contradict itself Simpson says the 40/40A/41 construction number run from 1 to 168 which is one more than quoted above. And 4/21 construction number ran from 401 to 430. MilborneOne ( talk) 15:10, 27 December 2008 (UTC) reply

The figures of 180,25 and 60 from the 71 Jane's are all "by the beginning of 1970", with the strong impression given that production of the WA-40 & WA-40A had ceased (referring to the 70-71 edition for details). From the Flight archive, it looks like production of the WA-41 and WA-4/21 ended in 72-72. It's possible that there could be some double counting in the 180 figure. Nigel Ish ( talk) 16:08, 27 December 2008 (UTC) reply