[Fisherdude]

Hi Barry,

Here's what I can help you with:

The Royal 1000
Introduced in December, 1957, as a 1958 model. There were six different chassis layouts, reflecting rapid changes as the new transistor technology developed. Last offered as part of the 1963 line.

The Royal 1000-D
Announced in a July, 1958 press release as a version of the 1000, but with a $25 option for a long-wave band. This is probably your best clue as to the difference between the original 1000 and the D model. Both were marketed and sold simultaneously. There were at least seven chassis variants in the D model. Last sold as part of the 1962 line.

The Royal 1000-1
Announced in a December, 1963 press release as part of the 1964 line. The "-1" indicates the addition of an input jack for a 12vdc outboard power supply. Last shown in the 1968 line. Two chassis variants, 9HT40Z2, and 9HT40Z8.

So:

1000: No longwave band.
1000-D: Longwave band.
1000-1: 12vdc input jack.

Hope this helps!

Clay