A bit late but here’s mine. 

Thanks Orange4ever,
Your pic definitely shows only 5 rollers like the typical D7 and not 6 as mentioned by David Doyle in his book.
The serial number is in the correct range of under a 1000.

If you are around your machine could you check to see if it has the ACF logo embossed in the sheet metal around the seat area.
Above in this thread Deebo has a good picture of the ACF logo that was on all the 4T and 6T machines.

Thanks again.