Speedy 145.022 dials - long / short S & R

Hi All

I've got 145.022-78 s/n 44820xxx

It came with this dial, i.e. short "S" & "r" at either end of "Speedmaster"



Is that right? Or a service replacement? Curious to know when the longer letters were used and if they co-existed with the shorter ones.

Thanks

THANKS very much appreciated.

Well, it came with a service replacement caseback (“145.002” and underneath that “345.002” -- presumably doing double duty and serving both references?). However I have since sourced a -78 caseback for it from a member here as it clearly seems to be in the right range. (Although it could be post-78: the 44 million serials seems to be all over the place: I've seen EoAs ranging from 1978 to 1984.)

It's had a hard life but it was very cheap and I do really like it, so happy to have it and (more importantly) I love it and wear it almost all the time.