Koyo Electronic Industries Co. Ltd.
Tokyo, Japan
KTR-1661
Also seen badged as a Interceptor 1880
Interestingly this 1970 VHF Supplies advert said the 1661 has the best airband reception of any receiver apart from the Park Air 10SS
KTR-1662
Also seen badged as a Interceptor KTR-1662
KTR-1663
KTR-1770
KTR-1883
