The Avion was the imported from Japan for Ibis and was the more "entry level" model. This is a NOS frame with a mostly NOS Shimano Deore XT SIS 6 speed kit including the Shark Fin and Shark Tooth. The first indexing XT (With white XT letters) was only offered in1987 and 1988. The stem clamps around a stub that was brazed into the fork (pre Aheadset days).
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More MOMBAT-themed resources.
"Ive seen mountain bike rides transform people not just their bodies but their way of thinking. Their spirit." Charlie Cunningham