" The original single checks had a plastic Hardy castle emblem on the spool release mechanism so the spool is prob. from an original double check salmon 2."
That is true however, I had a Hardy Salmon 1 with aluminum cap on the spool release and silver spool,,,,this reel had a single check with circular plastic ring. I bought it new and that was the configuration direct from Hardy.
Some of the early Marquis had black plastic release caps on the spool,,,,,,I also had several Hardy manuf. Scientific Anglers System reels which predated the Marquis,,,,,some had single checks and some the later double checks.
Interesting and confusing combinations of parts were used in the manuf. of these reels.
Regards,
Fred Krow