Spent some time looking through old adverts, articles etc. in my collection of VW Motoring mags to try and find some of the 79s. Took an age as I have every issue from Jan 1977 - Dec 2005.
Anyway, I think we now know of 16. I'll list them all here so they are in one place. Some more pics too.

EPM 710V Black 20/9/79 The recent ebay barn find.

LYB 221V Green 7/8/79 Info found in a 100,000 mile club listing in VWM. No pic

GNR 560V Green 9/10/79 From a VWM classified ad.

COJ 559V Black 1/9/79 GTmatt's car from on here.

JLM 215V Black 1/10/79 Pic found online.

HVV 502T Green 5/7/79 VW press car, pic found in VWM.

HVV 503T Green 5/7/79 VW press car, a well know pic.
ACN 50V ????? 22/8/79 Info in this thread, no pic.
CPV 85V ????? ??/??/?? Info in this thread, no pic.
JLD 266V Green 1/10/79 Info from this thread.

CDP 120V Green 5/9/79 Pic found on Flickr

CMU 829V Black 21/9/79 From VWM, spotted in an article about a breakers yard.

COJ 565V Green 1/9/79 Featured car in VWM.
FPF 623V Green 2/11/79 Shavhead's car, reg from start of this thread.

GMS 367 Green 18/9/79 Spotted by me 'somewhere'.
YTC 500V, another V reg that came to light in the 'introduce yourself' thread but DVLA doesn't have any info. Could be a 79 but who knows?
So where is number 17? We may never know.