Is this an RPM or just strike doubling?

1952 D Jefferson -
I didn't see one like it in Wexler's book or on Variety Vista to compare. However the flatness has me at 95% certain its SD.
How I pay the bills:
https://imdb.com/name/nm1835107/
https://imdb.com/name/nm1835107/
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I'm thinking more along the lines of DDD with those flow lines and nothing inside the D. Jeffersons are not my strong suit, but I would say definitely not an RPM.
Is the date posted on Variety Vista?
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there are a few D/Ds but not in this orientation.
https://imdb.com/name/nm1835107/
I believe this is RPM.
I think it may be both.
triple die