As part of the restoration of our Weltrol. We have split one of the Bogies apart, just about totally. This to enable removal and a repair / renewal of the spring base plate. This has released the 2 nested coil springs. On one of these springs is the Marking - LNE MAR IBBOTSON 1939 From this I would infer LNE = LNER MAR - No idea Ibbotson = Manufacturer? https://www.gracesguide.co.uk/Ibbotson_Brothers_and_Co http://www.calmview.eu/SheffieldArchives/CalmView/Record.aspx?src=CalmView.Catalog&id=MD8197 1939 = date of manufacture. Can anyone suggest an explanation of MAR?