I found a late 1986 Winter Sale flyer from Mountain Bike Specialists that specifically mentions two version of the 1986 Montare, stating,

"1986 1/2 Montare.. With the latest geometry, this bike is ready to race or tour. Now save $100! Just $699

Or get the sllghtly older design, 1986 Montare for just $659!"

If Mountain Bike Specialists were calling them 1986 and 1986-1/2 models, that was likely an official Fisher designation.