Although the above yields (what I consider to be) sensible results for rare models, it seems to break down for the 46b Beales Bealsons pantechnicon.Idris wrote:As regards rare models, my rules of thumb are a survival rate of 10 - 15% (I can't remember what the source of this is, but I read it somewhere) and the fact that, for every model we know about, there's one in a sleeper collection. So, if we know of six example of a particular model, that means there are probably actually twelve still extant, meaning the total production was somewhere between 80 and 120 examples. Since Lesney would probably have worked in dozens (certainly in the RW era), that means between 7 and 10 dozen were produced.
Production is supposed to have been just 3,000 models, the source for this number being an article many, many years ago in Scale Models magazine. Using my rules of thumb, this gives a survival of between 300 and 450 models. Halve that for those tucked away in sleeper collections and that gives 150 to 225 'visible' models (i.e. those known to be in collections plus those for sale on the open market). However, there always seem to be a handful for sale on Ebay and, having just checked, I see that, looking at what's on offer currently and what's recently been sold, there are eight in total (a low figure compared to previous checks I have made), i.e. about 5% of the visible models. I think the sold listings on Ebay go back two calendar months, so that means that 30% of the visible models change hands every year - which is quite patently absurd.
I'm reasonably confident in my rules of thumb, so that means that the production figure must be wrong. Could it have been a typo? Was it perhaps 30,000 instead of 3,000? The former makes much more sense in terms of what we see go past on Ebay. Not only that, but it strikes me that 3,000 models doesn't go very far if you've even a small chain of department stores.