John R Smith
Western Thunderer
The Royal Scot, even the rebuilt version, always used the cab and platform, footsteps etc made as per the original lithographed model. And the Royal Scot was less expensive than other similar sized soldered construction models, presumably due to more parts being produced using press tools.
The parallel boiler Scot seems to go through a lengthy metamorphosis, from the fully tab-and-slot tinprinted original with MR tender, to the addition of smoke deflectors, coal rails, then the high-sided Stanier tender and soldered construction with engraved nameplates, from crimson lake livery to all-black in its final form by 1952. But even the late post-war versions like mine still have tabbed splashers (but soldered up).

My list may be out of sequence, and where exactly the date/hinge points for each variant are is a puzzle, although we could probably make a guess.
As far as the B17 goes, I think there must have been two batches. One for "Arsenal", the first to be listed in the 1937 catalogue. And the second for "Melton Hall", perhaps in the following year. Interestingly, both variants occur with the 16 spoke boss-plate driving wheels, so there seems to have been no progression in wheel types from one batch to the next (I am assuming that the 16 spoke engines are original equipment, as I can't imagine anybody retrofitting earlier wheels to a later engine). The snag is, my online photo samples are exclusively of electric drive models - I can find no clockwork examples - so the clockwork versions may have had the later type wheels. Perhaps.
Which leaves us with another puzzle with the Vectis "Arsenal" - is it what it purports to be?
John
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