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Looks like shutter capping to me.
With the back open/lens off look through as you run through the speeds. Likely you won't be able to see it unless it's a really laggy curtain/mirror.
Run a roll against a plain wall with a tripod, test all shutter speeds in progression for the whole roll. Best to see if it's consistent across all speeds or just one.
pdlouche
spunk_nautical
Sorry I meant to say it's fully retracting at every speed. Which led me to thinking it was out of sync with the shutter.
And true re. servicing. An excuse to get something a bit nicer now.