These are in awfully good shape. #651 is from the early-mid
1960s, #741 is from 1973 and has been marked Dec. 1973 on
the front cover (see photo). No writing on #651. Both still
have the mail-order form inserts, and there is one Spilhaus
Space Clock insert as well. Both are very clean. Email me
with any questions. Will sell separately if desired.
Paypal is preferred, but will also accept US Postal money
order. All reasonable offers considered. Please indicate your
method of payment if making an offer. Thanks for looking.