This Supplement is filed pursuant to Rule 497(d) with regard to
Government Securities Income Fund GNMA Series 1Z
Defined Asset Funds
The text of the supplement to the Prospectus dated August 28, 1996
is as follows:
Supplement dated June 27, 1997
to Prospectus dated August 28, 1996, of
Government Securities Income Fund
GNMA Series 1Z
Defined Asset Funds
_______________________________________________
Effective immediately, the following replaces the
Initial Offering Period Sales Charge Schedule in Appendix A
(the Secondary Market Sales Charge Schedule remains unchanged).
Sales Charge
(Gross Underwriting Profit)
------------------------------
As Percent of As Percent of
Amount Invested Offer Side Public Net Amount
Offering Price Invested
- -------------------------------------- ----------------- -------------
Less than $100,000..................... 4.00% 4.167%
$100,000-$499,999.... ................. 3.00 3.093
$500,000-$749,999...................... 2.50 2.564
$750,000-$999,999...................... 2.00 2.041
$1,000,000 or more..................... 1.50 1.523
15354-8/96
