Hello. I bought this primered-only Schwinn Sting Ray fork from a shop years ago and am trying to id. Left dropout code 9 + 4 Pic isn't the best but the stamping is very clearly 9 + 4 I assume it's a 1974 fork from the date code, but am a little puzzled by the 9 + 4 and wasn't sure what the plus was for. 5 1/4" steerer tube length, 12" from axle center to top of crown. Chrome fork cap, for caliper brake use. Original Schwinn sticker says "....... ...... BOYS CAL.PC" The block letter Schwinn font on the sticker suggests post 1973. Perhaps a replacement fork sent to a dealership? Any shops that painted these with Schwinn's blessing? Any help would be appreciated!