This model of viewer was named the J viewer by the U.S., Beaverton factory, and called a #10 by the Brussels, Belgium factory.

The Model #10 enjoyed one of the longest production runs  from 1974 into the 1990s.

The Model #10 , because of its long production run, saw production variations in colors more than any other View-Master viewer in Europe, and a close competitor to the American made Model G s. The blue #10 is among the more uncommon color #10 viewer.

Condition:
Excellent with far less than what would be normal wear.