circa 1958. First edition. Trade Pamphlets, Color Wraps. 8 1/2" x 11", pp 8, pp 4, pp 7. pp 8. b/w construction details throughout. Very Good+. Item #16903
The Allweather balance strip was a sash balance weather strip combination. The Unique Sash Balance had a counter-balance mechanism, and the Zegers item was also a combination weatherstrip/sash balance.