Nutloose, thanks for posting. The first picture is XS511 where you can just about see the usual arrangement with the small ammeter and the blanking plates. Very unusual thing bolted over the clock hole !
The others are XT761 at HH and the bottom picture shows the area of interest with two large "ammeters" and something in the small hole at the bottom that is hard to see. If you compare with post 22 (lower), you can just about see that the cutout at 8 o'clock in the top hole has been blanked,
Last edited by smirky; 10th May 2022 at 19:02.