Yes I think the date is wrong, it must be earlier probably shortly after delivery given the general condition of the loco, sandboxes and absence of tablet snatchers. I have just watched a Crossley Bros 1956 film of A1 on delivery and there were no snails on it or snatchers fitted, so snatchers probably fitted after delivery or when they appeared more frequently on the single line tablet controlled sections. I need to try and locate the original neg and see if there is any info on its cover (this could take as long as it took for the Model 'A's to materialise!)