HERES MY THOUGHTS..... THIS BIKE IS DEFINATELY PACE, PROBABLY FROM AROUND '89 AND PUT TOGETHER BY DUNCAN MACDONALD WHO WAS THE ORIGINAL PARTNER ALONG SIDE ADRIAN CARTER. ITS OBVIOUSLY A TRIALS BIKE, BUILT WITH A PACE TUBESET (HENCE THE RC-100 RESEMBLENCE) WITH NO PROVISION FOR MECHS. DUNCAN WAS THE DESIGNER / FABRICATOR AND ADRIAN WAS THE SALES & MARKETING GUY AND BECAUSE OF HIS INVOLMENT IN MTB RACING WAS THE SOUND BOARD FOR DUNCAN. IF YOU LOOK AT THE FAMOUS DPD (DUNCANS PURPLE DECENDER) FROM AROUND '92, YOU WILL SEE A LOT OF RESEMBLANCE TO YOUR FORKS ALTHOUGH THEY WERE SUSPENSION, THEY ARE BOTH DUAL CROWN.
THE REASON I SAY AROUND '89, IS IF YOU LOOK AT YOUR PICTURES, PACE HADN'T YET MADE THE ONE PIECE STEM AND THERE HUBS... YOURS ARE RUNNING BULLSEYE AND A SHORTENED QUILL STEM. THEY DIDN'T MAKE THE FIRST PRODUCTION RUN OF RC-100'S UNTIL LATE '89 SO YOUR BIKE I'M GUESSING WAS SLIGHTLY PRIOR TO THAT.
HOPE THIS HELPS.....