Found it, Hatari Times Issue No. 1 has a left side photo of the Jamieson 500 Jeffery.

And photos of Tony Sanchez-Arino's 500 Jeffery rifles, all in a 9 page article by Tony and Harald Wolf.

I am betting that Harald Wolf has more photos of the Jamieson rifle.

If you are a 500 Jeffery fan you need to read this article!