Its very much possible that the bug was european spec semaphore model. The semaphore slots on the pillars can be filled and welded in during its course of life, as she seems to have received a lot of molestation so welded semaphore pillar slots wont surprise me much, if thats the case. This has been seen on @AsadIshaque's 1959 RT as well, here is a picture that I borrowed from his DIY thread for reference:
In nutshell, I agree with you, she needs to be saved! And to answer your query, yes the european models seized to receive semaphores in 1960.