As any of you who deal with the US will know, the recent government shutdown has had an effect on American spending, and my online shop has ground to a virtual halt. This left me scraping out the bottom of the Paypal account last weekend for a joblot barely worthy of the title - a 17d Foden, half a Hendrickson and this 15c - my first


Back to the Tippax - it is in every respect a Code 5 but has no trim. As you can see it has Chassis 2 with no crossmember but the longer body rests. This is exactly the sort of question raising item I love, and I can come up with 3 possibilities for someone with more Lesney factory knowledge than me to answer.
Firstly (my preferred option) I consider it possible that if the silver paint ran out towards the end of a shift/run/Friday Afternoon then the last few models went through without the trim. This is reinforced by the existence of Code 6 which is Chassis 1 with no trim. This then raises the question - at what point do you consider such models variations rather than error pieces?
Another possibility is that Chassis 1 and 2 were being produced at the same time, and during this time the use of silver trim was stopped. I find this unlikely as the differences between Chassis 1 and 2 seem to be deliberate introductions to stop the Tippax's breaking in half.
The last possibility is that somewhere along the line some Chassis 1 and Chassis 2 were 'lost' and then rediscovered and put down the line along with Chassis 3 examples. This is where factory knowledge helps. I know of instances where lathes have been replaced in factories and finished products obsolete by 9 years have been found in the tool drawers, having been put there by machinists who intended to make them 'reappear' closer to the order deadline when piecework would be brought in. I can't see how this would work in a high volume diecast factory but I may well be wrong.
No matter what the explanation, as we now have both Chassis 1 and Chassis 2 with and without trim it seems to me that the trim alone is not a very reliable method of placing models on a timeline?